Hero has a tight image, BTN is loose preflop but when lots of $ goes in he usually has a big hand, I've seen him slowplay and even check riase the river with a full house on a flush board on 2 occasions this session. The SB is a loose gambly type that will overplay his hands.
Hero raises UTG with T
to $10, MP calls BTN calls, SB calls
FLOP (POT ~$40) 9
Hero leads for $26, button calls, SB shoves for $128, Hero calls, Button calls.
TURN (POT ~$430) 4
The button's flat call is very strong here IMO, I don't think he has any 9's in his range but I don't want him to draw if he has say the NF and SB is shoving a nine. What is the best play here against a somewhat competent player? Is check folding ok in this spot?