Forgot to mention, both villains are marked as spewy fish!

Looks fine to me if they are both fish. If we had position I'd learner towards calling their raise over jamming. Long as you don't fold both are fine.

Against spewy fish, jamming seems fine. BUT, generally fish do not raise their draws, so we will get it in max as a flip. More specifically vs this range:

http://www.power-equilab.com
Equity Win Tie
MP2 39.62% 39.26% 0.36% { KhJh }
MP3 60.38% 60.01% 0.36% { TT, 88, AQs-ATs, A8s, AQo-AJo }

Which is not really attractive and furthermore BB will probably fold dominated draws.
Furthermore, fish generally dont habe a folding range when they start raising 3way, so we can not consider fold equity by jamming.

Conclusion: Calling should have slightly higher EV.

Hope I helped you.

Best regards

Pre: Standard, I like the iso here for sure.

Flop: We have initiative in the pot here and we have oodles of equity if we get called so I do like c-betting here, we also have a ton more Ax than our opponents will have here. I don't hate check calling here but my preference is for sure to go ahead and bet. When we get raised I don't hate the jam by any stretch but I think calling will have a higher EV. It has been raised in a multiway pot so it seems pretty likely our opponent has a hand they are not planning on folding. We are in a rare situation where we are getting the correct direct price to draw here and if we flat we can encourage the BB to stick around which is only good for us as the extra player won't change our equity much since all of our outs are to the nuts, and it will increase the pot which is great for us.

I think the key point mentioned already is that we almost certainly don't have much, if any at all, fold equity.

There is always a chance villain has a worse flush draw, but with the flop being multiway I would expect him to be calling those combos more often than otherwise. If the other guy is a fish as well then calling potentially helps our pot odds if he comes along as well.