Bro buy the one you like they both run fine. As far as Glock reliability, we run probably 20 Glocks in our range rental program. Seven of these are G19's kept in a bag just for concealed carry classes. Those seven came from Yonkers NY PD probably seven years ago when they were traded in for new G19's. They were cleaned when we got them and not since and I know they will run fine when I take them out in two weeks for our next class. As I write this there's a G20 10 mm very close to my right hand loaded with WW Silvertips that I haven't touched in months and I know it's ready if I need it. Pretty much the only trouble we see with Glocks are from folks changing parts. I like Glocks but they aren't the only guns out there either. I don't stock guns or ammo that I wouldn't use myself and we sell lots of S&W, Sig, Ruger, Walther, H&K and others. I think most guns work pretty well today if people would leave them alone and learn to shoot them. There are no magic bullets and you can't buy enough triggers, and springs, and racing strips to make up for a lack of trigger time. We have a big monitor that I can watch the range on and I can't believe some of the crazy positions people use to shoot from. And I have noticed that the worse they shoot the faster they shoot. You can't miss fast enough to win a gunfight. It is amazing how much a shooter will improve after spending one hour with one of my instructors. Personal instruction from someone knowledgeable and who can explain that knowledge is the best money you can spend. When I started yoga a few years ago I started with private lessons and did two a week for a year and it may have been the best money I ever spent. Starting the morning with an hour of yoga surrounded by women in yoga pants puts a smile on my face.
OP - Read this post. Lots of very good advice here, imho.
The initial cost of the gun is nothing compared to the ammo cost. You can't go wrong with either.