In my experience, it really doesn’t matter that much. I think one of the bigger questions would be whether or not you want to use Logic. If you do, then Mac is the way to go. Otherwise, any computer will probably do you justice.
Macs do have an ‘artsy’ following though. People in college seem to get macs if they are going into music, art, graphics, etc. I’m not certain as to why though.
One thing I can say is that the hardware is very very quality when you go with Apple products.
The operating systems have advantages and disadvantages. I think Mac’s Operating System is superior (It’s updated more frequently), but not to the point where it should be a decision maker.
Another thing you should consider is familiarity. If you’re a Windows guy, and you’re switching to Mac, there are probably a lot of things that are going to take getting used to. And that means time and frustration. (At least it did for me…)
So I really can’t give you a solid answer. But I hope that can help you anyway.