34 because it is cheaper to shoot. If you reload, it doesn't matter too much. 9mm cost about 2/3 of .40 S&W. If all you are doing is shooting steel poppers and paper targets, go for the 34.
This is an older thread, you may not receive a response, and could
be reviving an old thread. Please consider creating a new thread.
Glock Forum
A forum community dedicated to glock owners and enthusiasts. Come join the discussion about optics, holsters, gunsmithing, styles, reviews, accessories, classifieds, and more!