M-Lucario vs M-Medicham (MSU use)

Hey guys! I got to the point where I used MSUs on the most obvious Megas (Gengar, Rayquaza, Mewtwo Y and Garchomp) and based on the general opinion, my next one should be M-Lucario. But I was thinking that maybe M-Medicham could be better.

About M-Lucario:

• Takes 4 MSUs. After that, requires 10 icons to evolve.
• You can use Medicham as one of the other supports to help it evolve even faster.
• Has a mega-ability that is terrible at creating combos but might be good at getting rid of any kind of disruption.
• Has 90 AP when maxed.

About M-Medicham:

• Takes 6 MSU's. After that requires 15 icons to evolve, but has built-in Mega Boost so might evolve just as fast as M-Lucario if you're lucky enough.
• You can use Lucario as one of the other supports and take advantage of Pummel throughout the entire match.
• Has an overall better mega-ability than M-Lucario. Better for combos, at least.
• Has 80 AP when maxed.

M-Lucario is definitely more popular. But is it really the best option? Maybe. I don't know. That's what I wanna talk about.
EDIT: I guess I'm already convinced to save my next MSUs for future Megas. Based on what people said on the comments so far, neither of them seems to be worth it. Thanks guys.