I was thinking more about the longer sight radius.
In addition to what has been said, compared to the G19, the G17 is:
0.47" longer,
0.43" taller,
I carry my 19 with a 17 clip in it. With a clip extension on it, it very smooth and I like having the 2 extra rounds!Makes a big difference though for IWB! The G19 size is much more comfortable than the G17. You give up 2 rounds, but there's not much difference between 15 an 17.