I've only owned the knockoff apple silicone cases and they are very grippy but fell apart after a couple of months and often got stuck in my pocket. After that I bought the new 6/6s battery case. It's is the same material as the regular apple silicone case but I think you could call the battery case more grippy because the battery forms to your palm when holding the phone. Still, it was a little too grippy and would stick to my pockets- not as bad as the knockoff silicone though.
Since I have switched to a Plus, I have been using the spiegen air cushion and the magpul carrying case
both have a decent amount of grip. Doesn't get stuck in your pants and doesn't slide on a table or in your hand, which is exactly what I want in a case.
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I agree with this. The silicone cases are the only ones that so far have met my needs as far as grip goes. Don't have the lint issue though but maybe it's cause it's in my purse a lot