I like them both. I'm already heavily invested in Glock though, so I don't see myself making the switch. My favorite polymer wonder pistol currently is the FNX Tactical 45 I recently RMR'd. A little on the big side for EDC though.
. . . Yes the M&P may feel better in your hand while holding it, then feel different when you shoot it . . .
I have an M&P9 VTAC with a Pro Series frame. I LOVE the M&P. I have had both the g17g4 g19g4(&)g3. The M&P's feature I believe are better BUT I prefer the Glock 6 o'clock sight picture. Like all 7,321,548,429,174,324 answers to this question there is only one answer: RENT BOTH, SHOOT BOTH (MORE THAT 50 ROUNDS) TO SEE WHICH ONE YOU ARE COMFORTABLE WITH. Yes the M&P may feel better in your hand while holding it, then feel different when you shoot it.
M&P gets my vote. Fits my hand perfect.