Definitely DO use a screen protector, they will scratch and better than having to bother using Applecare+ (some of us more so as everybody isn't so lucky to have an Apple store anywhere around us). As for which kind you will get varied opinions. I have almost always used dry ones and I'm very good at putting them on, don't do anything special I just make sure to put them on the device right out of the box so the screen is already clean, or clean it real good if it's not new and make sure no dust/lint is on then quickly do it before letting it get dust/lint on it. I've tried a Zagg wet apply on an iPhone years ago and destroyed it horribly, ended up returning for refund. Later I got a Skinomi wet apply that's currently on my iPad Mini, it works but it has some wierd texture and odd spots on it that cause a rainbow effect and even a little scratch out of the box which is something I've never had happen with a dry apply, so I stick with those from now on.