I own 2 glocks a 19 and a 23....and several other hand guns. I say if it fits your hand its a good choice but...also try a springfield xdm or 1911 9mm. I have both and love them...sig mark series. Kimber solo. S&w m&p and shield. Colt new agent ..and actually eaa witness. Idk i love them all : D
Glocks are fine pistols for defense. I find the consistent trigger pull easy for teaching new shooters. The lack of redundant safeties can be a good thing for new shooters as well. All that I have to drill into a new shooter is to keep the finger off the trigger until ready to shoot. I don't have people returning their pistols to a holster and forgetting to re-activate the safety. I don't have people forgetting to turn safeties off during stress drills, either when drawing from a holster.
All handgun callibers are pretty marginal for stopping a threat, but 9mm, .40, and .45 when placed properly and using good ammo are proven to be effective.
The above are excellent reasons to choose a Glock. And the Model 19 is a good choice, just the right size for most folks. If you want to conceal then maybe the G26, though some people like a thinner single stack pistol. 9mm is the popular choice but I like the G23 40 S&W.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek
Owned, used, and carried a Glock 26 since 1995. Never a problem. Use a Glock 17 for range work never a problem. Looking at a Gen 4 to update collection. For the price I don't think you can do better, they'll shhot anything