Hello,
I can only speculate on my undergrad university experience and tell you that using my MacBook Pro was GREAT. I personally like typing what the professor is saying as well as including any additional notes, and these days almost everything is compatible with Mac OS. Also, I think if you sit near the front of the classroom you could also record your professor's lectures using your macbook.
I also really like the macbook as it's relatively light compared to other laptops and very user friendly, very reliable, and very powerful. I do realize you're already dropping a lot of money on tuition, and that macbooks aren't cheap, but well worth the investment. Also good on battery life (up to 3 hours).
If you don't think you'll be using a computer a lot, then maybe a netbook would suffice. They are less powerful than laptops but have a great battery length (over 3 hours) and are very light. They are smaller too, but I remember when I had one they were really nice to carry around campus and easy to use.
If you are using Microsoft OS and are thinking of getting an Apple computer, I recommend buying the computer at least a month or two before you start your program so that you can adjust properly to your new computer. I remember when I first started using my macbook I was extremely frustrated at first because I couldn't maneuver/find things properly, but with a little bit of time you'll find it's super easy once you're used to it. I just think that's a good thing to do in advance before starting out medical school. Good luck!
