i own neither of these but i did own a 40 cal s&w sigma which the m&p is based off of..... i hated it. ungodly heavy trigger pull. was luckly if i even hit the target at 15 yards. traded it in and got my 9mm tauras 917 which is now my carry gun for the few times i do carry.

go with the sig in my opinon.

Almost comparing apples to oranges. If you want a trouble free, ultra reliable, kick around, self defense battle pistol made with plastic go with the M&P. Don't get the Sigma models confused with the M&P models as there two different animals. If you want perhaps a more maintenance required, but much more eye pleasing steel 1911 style pistol go with the Sig. I do have to say that Sig is one of the nicest looking handguns I have ever seen. Wow.

If you have the $$$ for the Sig Scorpion, man get that and don't look back...

Any way you can rent versions close to each and try them out??
I have shot a variety of 1911's and two versions of M&P.
I like the M&P better because of lower recoil and comfort and safety.
Don't care for the 1911 type...less rounds in the gun, etc.
Hear a lot of talk about M&P;s at the IDPA....people love them.

But see if you can try them out or find some similar to try first.

Because it's a SIG 1911

Thanks guys. No more votes needed. It's been decided and he's getting the Sig tomorrow! Yay!