I can't stand the silicone cases. They are grippy (good) but are very difficult to get in/out of my pants pocket (bad). My wife likes hers, but it goes in a purse so she doesn't experience the drawback frequently.

I've been using the Apple leather cases for my last two phones (including the X). They aren't as grippy as the silicone cases, and they cost more, but I find they feel better in the hand and don't have the "stuck to my pocket" problem.

I used to be a "no case" person as well. I dropped my 3GS a half dozen times and it just got dinged up corners. Same with a Lumia after that. I dropped my Nexus 6 about 5 inches and the screen shattered. Started using cases after that.

I too prefer the leather cases, but mine started breaking and the plastic to which the leather is bonded made for a very sharp edge. I cut my hand a couple of times just trying to get the phone out of my pocket. Too expensive to easily justify a replacement.

The leather cases don't stand up well to sweat, especially if you have heavy salt content in your sweat (I've had both style cases, the leather ones look pretty bad quickly)

Personally I’m a fan of the Otterbox cases, especially Symmetry. They don’t suffer from the pure silicone case resistance to sliding into pockets but they do subtly improve grip and would seem to offer pretty solid protection.