Rubber texture if it will be against your skin.
Sandpaper texture if you want the most grip possible and won't be concealing it (not only does it tear up your skin something awful, but cover garments stick on it rather than slide)
I tried the sandpaper/grit texture for a carry gun after using rubber for awhile. I thought that with how some people actually complained about stock Gen4 grip texture hurting their skin, it wouldn't bother me...wrong, wore my skin raw within an hour or two and my cover shirt kept getting stuck on it. I took some fine grip (150?) sandpaper and really wore it down, I can carry concealed with it now and it's doable, but cover shirts still stick to it a little more. It does grip better than the rubber still, but I don't think it's going to last long the sandpaper treatment took a lot of life out of it