[gumpzilla]

I tend to prefer betting the flop. If this player isn't tricky, do you think he's going to go through the process you presumably want him to go through of "Hmmm, guy in last position bets at pot when nobody has taken a shot, better call with my J5?" I think a T can call you, I think betting the flop can frequently slow down an A on the turn and get you a free river, and if you get popped you probably have a pretty easy fold rather than calling down later on. (EDIT: Missed the diamond draw, which does complicate things. I like the check more after seeing that, but I think I'm still usually betting. Again, if you don't think your opponents are tricky, check-call is a more expected line than check-raise for a flush draw)

The river seems like an easy check behind unless you're convinced that this guy will call with a T. Occasionally I'll bet, gambling on that possibility, but usually I'm checking.