First, some schools will recommend particular hardware, so I would suggest you go with what they are most comfortable having their students use, it will make their support much better!
Second, I'm not an apple guy, I actually prefer pc/android to apple products, so take that for what it's worth.
I have an android phone, an ipad (school required it), and an ultrabook (lightweight windows laptop). If the school didn't require the iPad I wouldn't have gotten it. I have a keyboard cover for it, so I can do some minimal typing on it. There are apps that will allow you to edit word files, excel files, etc. Mostly I find they mess with my formatting and I have to rework them on my pc before I can submit. I do leisure time (what little I have) activities with the iPad, reading, etc, and on rare occasions I can listen to lectures on the iPad. That's about all the productivity I can get from it.
For about the same weight I have my ultrabook that has a larger screen, more connectivity, can use a real keyboard and mouse and/or touchscreen, etc. It runs windows 8, not that I like windoze 8 that much, but that means full office, flash, etc. Oh, and it cost much less! From a productivity standpoint, no comparison, the ultrabook is hands down more useful.
As for apps at the clinical site, I use my android phone for references (drugs, labs, etc).