I shot a 3rd G17 & a 4th G19 as well (as bad?) as each other.
The 4th comes with Goldilocks backstrap options. The smaller grip felt "Just Right to me.
The G19 is just a little bit smaller than the G17, no matter on a OWB, I wouldnt think, a bigger difference if using a IWB.
G17 mags can be used in a G19, G19 mags wont fit in a G17.
The 4th comes with three mags, the 3rd, two.
"Sometimes I pretend to be normal, but it's boring and I go back to being me."
"You might as well be yourself, people wont like you anyway."