Great video from Jeff
There are ALL sorts of smaller points, like cost, weight, size (both overall, and in what dimensions, such as double-stack vs. Single-Stack, and Size of the grip vs. barrel length)
And of course personal preference, like Revolver vs. Semi-auto, or Glock Vs. M&P.
But I think the big point is how much gun are you willing to lug around ALL THE TIME, and start from there, because a carry gun ain’t shit if you don’t carry it.
Carry your damn guns!