Highly subjective, bro, highly individual. The rougher the grip surface gets the harsher it is against bare skin in deep concealment, and on clothing.
I've personally had good luck with the sandpaper-like stick on panels...and with Gen4 polymids...and with stippling done by Tarnhelm, Robar, and Maglio. The RTF2 I found to be great on a match gun but a little too rough for my own concealed carry needs.
Ya pays yer money and ya takes yer choice...