I usually back test 3 or 4 strategy's for each equity, but I think Im partial to double calendars and atm calendars for the probability and risk reward.
Quadruple bachelor dragonfly hedged by married puts on binary options on annual winter Groundhog event and double hedged by a certified local palm reader (female) - former voodoo pro.
Credit Spreads using SPY. Deep OTM spreads, Bid/Ask spread <.02, Delta <.10, >1.5 SD, >.25 per spread, risk <500.
Considering that "earnings" happen almost on a daily basis throughout the trading year I have found it profitable/practical to not focus on one symbol but instead focus on the market as a whole. That's my favorite strategy, day in and day out.