If I check I can't call a bet, if I bet I expect to get called by one card flush + pair combinations
but if I check/raise maybe he folds those one card flush + pair combinations and top pair that he bets to protect against MY one card flush + pair combinations

this is a 23/16/3.7 (3b) ABC tag, so I don't think he has the balls to ship the NFD on me unless it's like top pair + nfd
sizing is a little large, though, I would like to leave myself room to bluff a non-diamond river
although I'm mostly repping a flush so my value range is actually not that wide because he'd expect me to c/c a set on the turn or to bet it outright

the reason I'm c/ring is because MOST OF THE HANDS HE HAS HERE SHOULD CHECK FOR POT CONTROL like Qx or JJ

Full Tilt No-Limit Hold'em, $1.00 BB (6 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

SB ($33.95)
BB ($135.10)
Hero (UTG) ($253.25)
MP ($127.70)
CO ($100.15)
Button ($100)

Preflop: Hero is UTG with A, 6
Hero bets $4, 1 fold, CO calls $4, 3 folds

Flop: ($9.50) Q, 7, 6 (2 players)
Hero bets $7, CO calls $7

Turn: ($23.50) 5 (2 players)
Hero checks, CO bets $15, Hero raises to $45

How do you like it? Is simply barreling better? Or just c/f?