Heck no! Although Glock has the the largest chunk of LE sales now, more and more departments are adopting Sigs! Soon enough Sig will be the leading manufacturer of sidearms for LE!
I've only seen a Sig jam twice that was because the P230 had around 30,000rds through it and needed a new recoil spring, after that the P230 was as good as new. I've seen Glocks jam several times, including a 17C that I owned. I've only had problems with 9mm Glocks, never with the larger caliber Glocks!