For the absolute best analysis tool on questions like this, check out Michael Shackleford (aka The Wizard of Odds) at www.Wizardofodds.com.

He has analysis for every conceivable (some may argue over-analysis) game of chance in Vegas.

The link below is his 'hand analyzer' where you can pick the specific game (I.e. Jacks or Better) and make your hand. It will show you the strategy of what to keep and the odds of winning of each.
http://wizardofodds.com/games/video-poker/hand-analyzer/

I always follow his advice when making a determination of where to play blackjack. It is amazing how much different the house odds can be from table to table in the same casino.