357SIGs a good round, its the one that our state police use. The DPS carries them in Sig P226 with DAK action, don't know much about Glocks, but the 357's a flat shooter and moves quick.
I'll admit though I was confused about why they switched. Ten years ago my old man carried a Sig P220 in .45 ACP, God's Caliber, but switched to .357SIG. Turns out they were more concerned about the long shots +50 yards, and the higher velocity which makes shooting tires more effective. Also, Sig cut them a hella good deal. The .357 round was new at the time and there's no marketing spokesperson better than the Texas Highway Patrol.