This is a great options trading question. Let me break it down.

The Scenario

You're comparing: - 99 DTE: $X total premium → $X/99 per day - 190 DTE: ~$1.92X total premium → same $X/99 per day

Same per-day premium, same strike (OTM put), different tenors.

Which to Sell: The Short Answer

Sell the shorter-dated (99 DTE). Here's why:

1. Theta Decay Is Not Linear

Theta (time decay) accelerates as expiration approaches. The same average daily premium doesn't mean the same timing of decay:

• The 99 DTE option will decay faster earlier in your holding period. With ~3 months to expiry, you're already entering the steep part of the theta curve.
• The 190 DTE option decays slowly for months — you'd have to wait far longer to capture the same percentage of premium.

2. Less Time for the Trade to Go Wrong

• 99 DTE: You're exposed for ~3 months. The stock has less time to move against you.
• 190 DTE: You're exposed for ~6 months. Same daily premium but double the "window of vulnerability."

3. Gamma Risk

• The 99 DTE has higher gamma, meaning delta moves faster as the stock drops toward your strike. But if you've chosen OTM with a comfortable buffer, the shorter DTE actually reduces total exposure to a tail event — you're out sooner.

4. Rolling Flexibility

Shorter-dated positions let you reassess and adjust strike/strategy more frequently. With 190 DTE, you're locked into that strike for much longer.

Does Your Stock View Matter?

Yes, but not in the way you might think.

The Key Insight

If the per-day premium is truly identical, the 190 DTE option is mispriced relative to the 99 DTE. In normal markets, shorter-dated options carry higher per-day theta — the fact that they're equal here means either:

• The 99 DTE is cheap (buy/sell something else), or
• The 190 DTE is expensive (good to sell), or
• The market is pricing in an event between day 99 and 190

That last point is critical — check if there's an earnings report or binary event in that window. If there is, the "identical per-day premium" may be an illusion driven by event vol, and selling the 190 DTE that captures that event premium could actually be the better trade.

Bottom line: absent an event-driven vol distortion, take the 99 DTE — same income, less time at risk, faster theta.

The Math

The 190 DTE actually pays slightly more per day ($0.1234 vs $0.1192) — about 3.5% higher.

This Changes the Answer

The per-day premium isn't identical — the longer-dated option is giving you a small premium for taking on extra time risk. That's normal market behavior (longer-dated OTM puts usually carry higher absolute daily theta because of the additional vega and tail risk embedded in the term structure).

Given the actual numbers, the trade-off becomes:

Sell the 190 DTE if:

• You have high conviction the stock won't approach your strike
• You're comfortable being locked in for 6+ months
• You want to reduce transaction costs (one trade vs. potentially rolling twice)
• The strike is far enough OTM that the extra gamma of the shorter-dated isn't a meaningful benefit

Sell the 99 DTE if:

• You prefer flexibility — reassess strike and strategy every quarter
• You think the stock could be volatile and want to adjust
• You can roll efficiently (tight spreads, low commissions)
• Your view is neutral but you want to sleep better with less exposure

The Real Question

At these levels, this isn't a mispricing — it's a genuine risk/reward choice. The extra $0.004/day on the 190 DTE is the market paying you for:

• Additional vega risk
• Extended gamma exposure window
• Opportunity cost of tied-up capital

If those don't bother you, take the 190 DTE. If you value agility, take the 99 DTE and plan to roll. Neither is a "wrong" trade here — it comes down to your conviction and your temperament.

Annualized Yield Calculation

Assuming the strike price of $500 is the capital at risk (cash-secured put):

The difference: ~31 bps in favor of the 190 DTE.

But Here's the Catch

This assumes you roll seamlessly at expiry with zero friction. In reality:

Slippage from Rolling (99 DTE)

Every roll means crossing the bid-ask spread twice (buy to close, sell to open). If the spread is, say, $0.20–$0.50 per contract:

• Rolling twice over ~190 days costs you 2 extra round-trips vs. the single 190 DTE trade
• That could easily eat 15–30 bps annualized

Idle Capital Between Rolls

If there's even 1–2 days between closing and reopening, that cash sits unproductive. Over two rolls, 2–4 days of lost theta narrows the gap further.

Real-World Math

After accounting for realistic friction — spreads, commissions, gap days — the two strategies are essentially a wash on yield. The 31 bps advantage of the 190 DTE disappears quickly.

So What's the Tiebreaker?

Since the annualized yields are near-identical after friction, the decision comes down entirely to:

• Conviction: higher conviction → lock in the 190 DTE and avoid roll risk
• Flexibility: uncertain view → 99 DTE keeps you nimble
• Event risk: if anything happens between day 99 and 190 that could crater the stock, the shorter dated gets you out before it

At these prices, the market is offering you a fair deal either way. Pick the tenor that fits your view, not your calculator.

• Your short put expires, you go to sell a new one, but the market has moved against you. Example: you sold a $500 strike put with the stock at $550. At expiry, the stock has dropped to $510. The same $500 strike now pays only $3.50 instead of $11.80 because it's much closer to the money. Your "seamless" roll just suffered a 70% income cut — or you have to sell a lower strike for even less premium, or take more risk at $520.

• Volatility collapses and the new premium is garbage. Example: you sold during earnings season or a macro scare when IV was elevated. By the time your 99 DTE expires, the event has passed and the VIX-like fear has evaporated. That juicy $11.80 you collected last quarter is now $6.00 for the same strike and tenor. The annualized yield you projected only holds if vol stays high — it didn't, and now your strategy's math breaks.

Updated Comparison

What This Reveals

The term structure is sloping upward — longer-dated puts pay progressively higher annualized yields. This is the market saying: "I'll pay you more (annualized) to take risk further out."

The 36 DTE is the clear loser here. Not only does it have the lowest annualized yield (8.31%), but you'd have to roll it ~5 times to match the 190 DTE's holding period. That's 5 round-trips of bid-ask spread, 5 chances for vol to collapse, and 5 opportunities for the stock to drift against you right when you need to roll.

The real contest remains 99 vs. 190. The 36 DTE only becomes interesting if your view is very short-term (e.g., you expect a quick pop and want to capture premium and redeploy capital elsewhere within a month), or if you're actively trading around a known catalyst. Otherwise, the market is telling you: don't bother — go longer.

Lowest Risk: Sell the 36 DTE

Despite being the lowest annualized yield, the 36 DTE is the safest choice — and the math is clear on why.

The Core Logic

Risk in short puts is not about annualized yield. It's about how much time the stock has to fall through your strike.

You're being paid more annualized for the longer tenors because they are riskier. The market isn't leaving free money on the table — it's pricing the probability of a move through your strike.

Why Shorter = Safer

1. Less time for disaster. A stock that's $550 today and $510 in 36 days is a -7.3% move. That same stock has 190 days to go from $550 to $400. The probability of a catastrophic gap through your strike scales with √time, and 36 days has roughly 2.3x less "time-risk" than 190 days.

2. Faster capital recovery. At 36 days, if the trade goes wrong you're out in a month. At 190 days, you're locked in for half a year. The shorter you are, the faster you can redeploy or go to cash if the macro environment turns.

3. You can stop anytime. With the 36 DTE, you do one trade, collect your $4.10, and walk away. With the 190 DTE, you're committed — or paying to close early, which erodes that yield advantage.

4. Gamma works for you on the exit, not the entry. Yes, 36 DTE has more gamma — meaning the option price moves faster if the stock drops. But you're collecting premium for just 36 days. You're not holding through an earnings report or a Fed cycle. You're in and out before gamma becomes a problem.

The 8.31% vs. 9.01% Trade-Off

You give up 70 bps annualized to sleep better. That's $3.50 per year on $500 of capital. For that, you get:

• 73% less time at risk (36 vs. 190 days)
• 5x fewer major economic/data events to survive
• Optionality to reassess every month instead of every 6 months

Bottom Line

If your objective function is minimum risk, not maximum yield, the order is:

36 DTE > 99 DTE > 190 DTE

The extra yield on longer dates is compensation for risk you've explicitly said you don't want to take. Don't take it.