You just have to try the different types and use your own experience with them. Some people swear by scott hurricanes and won't ride with anything else, you couldn't pay me to put another set of those on any of my bikes.
I personally like the ProGrip triple density grips the best, they are very grippy, comfortable, dampen vibrations and shock, but they're $15, sort on the higher end of pricing, and they probably won't last as long as a cheaper single compound grip. The dual-density ProGrips are almost as good, and cost about $9 for a pair. Just not quite as cushy and sticky as the triples.
One thing i've found though, is that generally the cheaper single density grips like scott hurricanes are more harsh on your hands, and also turn your hands black after half an hour of riding.
One strong suggestion i want to make though, is that when you go to mount the new ones, none of the grip-specific glues have ever worked for me for more than a day. I've tried all the tricks, and personally, here's the trick that works for me. Wrap the handlebars at the ends where the grip will be with a couple layers of tightly stretched electrical tape. When you get ready to slide the grips on, pour a little gas into the grip so that it's a little wet, not dripping and soaked. Then slide the grip on (they will slide on much easier if you puncture a little slit in the end for the air to escape). Let them sit like this for at least an hour, to give the gas time to dry, and they should stick pretty good. For me, the gas seemed to melt the compound in the grip so it kinda fuses itself to the tape, and that tape isn't going anywhere. I always put a couple bands of safety wire on them just to be sure, nothing annoys me more than loose grips, and it can really mess you up if one slides off going into a corner and you've got a handful of air instead of bars and brake lever... been there, done that.
If that seems complicated and you're unsure what i mean, just ask.
And any kind of grip for atv's, snowmobiles, jet skis etc will work on atvs, it just needs to be for 7/8 bars without twist throttle, which is the universal size 99% of the time.