a G17 dont have hardly any recoil as it is, they are very flat shooters. If it was a baby glock I could probably understand it, but not a 17.
Porting adds a bit more than 5db same as a brake on a rifle
and it does loose a bit of velocity.
I would recommend shooting both before commiting.

Or you could just buy a Beretta and get it right the first time :mrgreen: [poke]