First and foremost, 90% of the issues regarding both models you'll read about on the internet are perpetuated by a bunch of basement dwelling goons that go out to the range twice a year on the nicest of days. The other 10% are professional users, and you'll likely never run your gun remotely close to the levels they will so it's laregely moot.
When it comes to the gun industry, there is such a thing as "too much information".
Why do I say all this? Because most of the information you'll read is irrelevant to 90% of civilian end users, and both designs are more than suitable to your needs, it'll just come down to a matter of your preference.
Personally, I'm not a fan of the P320, not because it's inferior to my Glocks, I just don't really like them.
On the flip side, I use Glocks not because they're the end all be all of handguns they just fit the bill perfectly for what I wanted in a gun.
Best case for you, get out and meet some guys in the community and see if you can't get out and run a few hundred rounds through a variety of guns.
Who knows, you could go in saying "Glock or Sig" and come out the other side with a browning high power.