[Al_Capone_Junior]

With two pair on board, you won't get any calls from worse hands (than two pair) if you bet. Of course if you check, there's a very slight chance he'll bluff at it, but usually this won't happen. So what else might be gained by checking? He might bet his straight if he made it, in which case you can raise. Of course if he missed his straight, he won't bet anyway. Now if you bet, you might get him to raise you if he did make the straight, but I'd assign this a fairly small chance of happening, as he'll often be afraid of your full house. Few would fold the straight here, not heads up. there's also a chance he might have accidentally made a better two pair than you, and might call with that. Overall, I like betting more than checking, as you can't collect any bets by checking if he checks behind you, and that's too likely to happen. The only exception would be if he likes to bluff.