As someone else already said, check with your program first. I bought a 3rd gen iPod Touch - no camera and no cell phone - for my electronic reference, and I went with the Unbound reference suite instead of Skyscape or the new Pepid (I'm currently test driving the Pepid as my Unbound is up for renewal). I only had problems at one facility (a childrens' hospital) allowing me to use it once I demonstrated there was no camera and no cell phone, just reference materials. But each program and hospital differs.
I'm personally an Android fan and dislike the iOS, but most people find the iOS more intuitive. I suggest you look around at the programs you want to use, what platforms they're available on, and what platform you're most comfortable with.