I have a Glock G27 .40 S&W and the .357 Sig barrel. During the "ammo shortage" WallyWorld had .357 SIG pretty much all the time and I was able to stock up on ammo.
As far as operation, either round shoots equally reliably using the Glock .40 mags. One advantage is I can get one more round in the G27 mag when using .357 SIG.