use iWorks its compatible with both docs and pages and stuff
meaning you can import and export docs, ppt, excel stuff
so you get the best of both worlds, MS office doesnt have any compat with mac formats so i highly suggest iWorks
Definitely Office considering most if not all campuses will be using MS Office with their computer labs and what not. Buy it for compatibility above all. Besides, as a student you should be able to buy Office for 10 bucks at the student store.