For me, the OEM grip deteriorates due to the sweating of my hands, so just about any aftermarket grip with harder rubber is the ticket.The high dollar grips with softer rubber is a no go for me..
I have had the Kuryakyn ISO grips on 3 motorcycles now. They are thicker, which makes them easier to hold (yeah yeah, I can see the jokes coming (yet another pun)). I have nerve damage in my throttle hand from years ago, and was having issues with my hand falling asleep. Changing to the ISO grips stopped the problem.