I have been shooting for over 50 years, just shot my first USPSA production match earlier this month.
I have a G17, 320X5 and CZ Shadow 2.
I suck.
I used the CZ for my first match because I shoot it best in practice.
I don't think I would have been any better or worse with the G17 or X5.
I will continue with the CZ not because its metal, but because I shoot it best.
This is a great thread.
Don't worry about the weapon, practice, practice, practice with whatever works best for you.
Ford, Chevy or Mopar.
Blond, brunette, or red head. They are all good.
Varooom