I have yet to instal, but for a carry weapon, I think most will say the rubber. The granulate is like (or is) skateboard grip tape, like rough sand paper. It will snag your clothes, etc., whatever and also wear on your clothes. I would think printing would be an issue if it is snagged on your clothes as you move around rather than let your clothes flow over your grip.
The rubber, again, mine aren't installed yet, but has a great feels. Should add a very nice grip once on.