All else being equal, when deciding between two or three viable trades, I'll often choose the one that offers me the best opportunity to neutralize my "greeks risk." Meaning, if my overall portfolio is leaning a little long delta, I might favor the new trade that is short delta. If I'm long a bunch of premium and therefore have a high negative theta score for my entire portfolio, I'd likely choose to add the trade that offers me the most positive delta. My thinking being: if I can neutralize as many greeks as possible, then I put myself in position to let the individual edges and risk-reward ratios play out in my favor without getting negatively affected by any sudden changes in the overall market.
This also applies to timeframe.
A quick scan of my open positions today revealed that I have a relatively high number of open positions with October, December, and January expirations. But just a couple with November expirations. So taking an idea from All Star Charts' September Conference Call, I've found an opportunity that we can play in November.
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