I'm going to have to say call the 3-bet.

SB is a TAG, so you're likely behind here to TT-AA, AKo/s, AQo/s, KQs.

MP1 is all-in, so you cannot gain anymore money from him if you hit trips/straight/flush.

Still, you have great position with an excellent multi-way hand, and it's a multi-way pot. If MP1 weren't short-stacked and SB weren't a solid TAG, I'd be more confident in going with a cap.