Welcome to the site!
Tough choice. I think I'd defintely...
...buy a Glock.
Sorry; big Glock fan here.
The SIG will probably be more reliable and have less recoil; it might even be lighter when fully loaded, depending on the ammo you choose. The 1911's reliability will heavily depend on the manufacturer and the use of quality magazines to feed it; but if it DOES jam, it will make a splendid club.