The Glock 34 and to some extent the Glock 35 have taken over in IDPA shooting especially in Stock Service Pistol. Since the 9mm is cheap and has low recoil it has been big in competition and the 35 is catching on due to the low recoil of the heavier cartridge. But you are right the long slide is just a little better on the range even though the 17/22 is very capable.
Imagine a 10mm in a long slide, could sure make the squirrels live hard.
Imagine a 10mm in a long slide, could sure make the squirrels live hard.