I bought my laptop just before heading off to university thinking that I would use it to take notes in lecture. I never brought it in once. For me, there's really no replacement for a pen and some paper

. Especially in the science and math courses, or any course where there are a lot of diagrams and stuff.
Will you be living on campus or really close to it? If you are, a desktop might suit you just fine. If not, a laptop might come in handy if you find yourself stuck on campus in between classes and want to get some work done. Though universities will also have hundreds and hundreds of computers (most likely with windows

) available for your use, though you may have to wait in line to use one.
I still have my laptop, but really, a mini would probably suit me better

. For you, just ask yourself whether you need the portability or not.