I have the rubber on my G19 and and standard on my G21. I like the standard better myself after a couple uses but the rubber is a less abrasive choice for cc. Both grip nicely.
I own both and can tell you that the granular kind is very rough on your skin if you cc iwb. So I choose rubbery ones for my carry guns and the granular type for plinking and target shooting. The rubber texture still has a very good grip tho, I've experience no slipping at all when shooting my g27. which for being such a snappy gun I would have expected some grip loss but was pleasantly surprised. since it's a Kahr p380 I would guess you use it for carry, so I would suggest the rubber texture.