I like hard plastic wayyyy better. Every single time I had a rubber case I ended up taking it off within a week and either returning it or just throwing it away.
I prefer plastic. I have a case that is very thin and slides into my pocket no problem. The rubber cases tend to stick to my pockets. Maybe this is a personal preference, but I like the plastic ones the best.
I'm all about the plastic cases. I also like the metal one's as well like the Element cases you can buy. They don't get stuck in your pockets when trying to pull them out either whereas a plastic/metal case would slide in and out quickly and easily.
I prefer hard plastic. My main case is a Seidio Innocase II, but I also have a cheap knockoff of an iSkin Solo that I really like. It's tecnically rubber but doesn't really feel like it in use. I like that one for a little extra protection when I'm camping or at the beach.
I've been going mostly case-less for a while now, using just a skin for the back of my iPhone and an anti-glare screen protector. When I do use a case, I use an iSkin solo or a Paul Frank silicone case since they work with the skin on my iPhone easily. I used to prefer an Incase Slider, but even though it's a thin case and works exactly as I'd want a plastic case to work, it makes the iPhone more bulky than I want to put in my jeans pocket.
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