SB has 70. BB has 240 he is fishy 45/5/1.5 over 50 hands. Several hands ago he lead into me in a raised pot with a flush draw (I had air and folded SB called him down and lost a big pot when the draw hit).
I have 190.

Preflop: I open raise OTB to 7 with , both blinds call.

Flop (21):
Checked to me I bet 15, SB minraises to 30, BB calls,

Call or push?

Just because a line is +EV does not mean it is best.

I am in the calling camp.

We know that the call is + EV, since we have direct odds to call 15 in a 96 pot. And we might even extract more if we hit. If we miss we are last to act and can make decisions based on their actions. [Lets say shorty pushes for 37, we get 1:4 if BB folds , we get 1:5 if BB calls, and of course worse if BB pushes]
It is pretty straight forward and since we have the advantage of knowing both what card fell on the turn (i.e. obvious fold if board pairs), and villains actions, we are in a good situation.

If we push here, we take away our advantage of beeing last to act on the turn, and we do not know if it is higher or lower EV. Basically I would have higher variance, without knowing if I have a higher EV.

Hence I would just call

Since SB is so short I'd call, otherwise I'd obviously push.

I think pushing is better because of SB's stack size.