The big thing of course is that there is no serial number.
No 4473 form required.
CA has already banned them and Polymer 80 had to create a "serialized" line for the CA market.
The other thing is ergonomics.
Glock has a 22 degree grip angle.
P80 has an 18 degree grip angle which is similar to 1911 and it's a slimmer grip.

Accuracy is a function of barrel quality and also the lock-up.
Quality Glock aftermarket drop-in barrels must be easy to manufacture because there are a lot of them.
That KKM from Carson City is one of the standouts and they are moderately priced.
There are only a couple of barrel makers doing hand fitting on Glock barrels.
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NO STEP ON SNEK