The M&P has a better rep than the old Sigma.

I really like my Springfield XD in .45. M&P45 full size is a 10+1 rd 45. My compact XD is a 10 rd gun (4" barrel, compact grip). I can also use full size mags that bump mag capacity to 13+1 (has a grip extension that makes it a fullsize gun). M&P had an extended mag (14+1) that makes their full sized gun a mega grip gun.

S&W is less expensive, but a solid pistol. Smaller hands, get the S&W. Bigger hands, you have a choice.

As always, you are welcome to try my toys.