SilleeGilly

I'd go bet/call. Seems like a good spot to bet small like 1/3 pot to induce a bluff-raise vs an aggro monkey. Equity-wise running into a 9 sucks but given the player read theres really no room for folding plus given you have 4 nut outs and back-door straight and flush draws you can roll with it. I think checking gives off more of a check/call, pot control type play so therefore I doubt you'd get him to bluff at you I just think a super aggro monkey would feel he has more fold equity if he could shove on you.

I think you have to lead here always though my line slightly depends on hero's 3 betting frequency. Lower than like 12% 3bet frequency, it's a bet/fold and high 3bet it's a bet/call on the flop I feel. Bet/fold with the lower frequency because nobody would be playing back at you light, especially 3 way. Vice versa with a higher 3 bet frequency. But yeah betting in this spot EV-wise crushes checking because too many times this spot will check through and villains get to realize their equity with all sorts of weak flush draws, two pair combos, etc. The fold equity alone in 3 bet pots as the 3 bettor on ace high boards warrants at least a half pot bet almost no matter hero's holdings. In this spot given the wetness of the board I'd be betting around 2/3 or 3/4 pot, pretty standard.