There's no easy answer. According to the laws of physics, the best cap is the one with a value closest to 100uF, (a twenty nine cent 101uF cap should in theory perform better than a one hundred dollar 110uF cap, both 100u nominal). However, considering the tolerances of capacitors, the designers had to settle on a nominal value of cap that sounds best to them, and reject values that fall out that tolerance. So if your expensive substitute falls out of that design tolerance, it may not improve things at all.
(I am assuming this is a commercial made speaker and not a DIY. If it's a DIY then the answer is: experiment with different makes)
(I am assuming this is a commercial made speaker and not a DIY. If it's a DIY then the answer is: experiment with different makes)