Free peice vs unequal exchange? which is better?

Sort:
Colectomy

If presented with the opportunity to capture a free piece or to force an unequal exchange, such as the one shown, which move is preferable and why?

Edit: White to move

ArtNJ

Why is this diagram even a question?  It should be very obvious that you want the queen.  My childhood IM friend once lost his queen for 2 pieces and a pawn by accident, and it turned out the resulting position was a crushing positional bind where the two pieces and a pawn were incredibly dominant.  He then pretended he meant to offer the trade as a trap and got the game published in a chess magazine lol.  But that kind of positional bind is super rare.  For the most part, if you don't see tactics, and the difference is a ton of material, then your better off grabbing the material.  I think this is especially true until one gets close to expert.  

Colectomy

it is white to move here, and I guess i should have added that white plays the obvious and saves the queen.