I'd say bet. QT isn't likely to bet since there's too many possible hands that will call a river bet. Smaller flush may bet but it probably won't be that much. And he will call it anyway.

How can a J not call if he's been doing it the whole way?
A raise would either be J9 or some badly played 9 or set. I'd have to fold to a raise but I think there's too much value lost by checking in this scenario.

So Bet/Fold is my line. If I knew villian is more than capable of firing a QT or a jack at the river (but wouldn't call a bet) then I would check/call. But there's more of the former than the latter.