Weekly options offer more frequent expirations, faster decay, and cheaper premiums; monthly options have more time and slower decay. It’s a choice about the clock (and 0DTE takes weeklies to the extreme).

Weekly options

Weeklies expire every week (SPY now has daily expiries). They’re cheaper (less time value), decay faster (theta accelerates near expiration), and let you trade shorter-term views precisely. Great for active, short-term trading — but the fast decay punishes being early or wrong.

Monthly options

Monthlies (the traditional third-Friday expirations) have more time to expiration, so slower decay, more vega, and more room for a thesis to play out. Historically they carried the deepest liquidity and open interest (still concentrated there). Better for slightly longer holds and less decay pressure — but pricier.

Weeklies are cheap and fast-decaying; monthlies are pricier and slower. Pick by how quickly you need to be right.

How to choose

For intraday scalping, weeklies/0DTE fit — cheap, responsive, no overnight risk. For multi-day views, monthlies (or at least longer weeklies) give a thesis room and less decay drag. A beginner learning on a slower clock might prefer longer expiries (0DTE vs weeklies) before graduating to the fast stuff.