I prefer the Pachmayr version. The Hogue builds in a palm swell, which is too much on some guns, especially those (like the newer Glocks) that already have shaped grips. The Hogue rubber revolver grips are a more successful design, in my opinion.
The Pachmayr slip-ons generally help, they cut the irritation of some plastic grips and do help me hold on to the guns I've had them on, and they are thin without the annoying built-in palm swell humps.
I forget whether the Pachmayr or the Hogues are designed so they can slip over built-in grooves on the frontstrap of some polymer guns. One of them has material removed from behind the pointed parts of its finger grooves so it can work with built-in grooves. It's important to get the right one.
I have used the Pachmayrs on Glocks, my old Ruger P95, and my Taurus PT 145 (which they really helped on). I notice I don't have them on my current guns. But if you find yourself irritated by the checkering or find your grip slipping at all, they can help, and I think they dampen felt recoil a bit also. And of course you can trim them to the right length.