I've shot both and owned a SIG P220 for a while (only own a Glock 17 now).
The SIG is an easier gun to shoot well. It's forgiving for people with novice shooting technique. That said, it's never going to be as robust or durable as the Glock 21 (the P220 is not a P226! Anyone thinking otherwise is kidding themselves). Get a P220 if you're only plinking at the range, get the Glock 21 if you're using it for wilderness ATC or shooting in any competition that doesn't require using match sights.
The SIG is an easier gun to shoot well. It's forgiving for people with novice shooting technique. That said, it's never going to be as robust or durable as the Glock 21 (the P220 is not a P226! Anyone thinking otherwise is kidding themselves). Get a P220 if you're only plinking at the range, get the Glock 21 if you're using it for wilderness ATC or shooting in any competition that doesn't require using match sights.




















































