Cambridge Computer Science - What OS is used for the degree?

I'm currently buying a laptop, both for personal reasons but also because I saw this on the Cambridge uni website (which is my first choice):

"Therefore it may be useful to have a personal laptop. A basic laptop is sufficient since substantial computation can always be performed on University machines."

However, I cannot find any information about the OS used for the degree. Will buying an OS X device versus Windows advantage/disadvantage me in any way? Also, a bit off-topic, but which do you (Current students) prefer?

I'm currently buying a laptop, both for personal reasons but also because I saw this on the Cambridge uni website (which is my first choice):

"Therefore it may be useful to have a personal laptop. A basic laptop is sufficient since substantial computation can always be performed on University machines."

However, I cannot find any information about the OS used for the degree. Will buying an OS X device versus Windows advantage/disadvantage me in any way? Also, a bit off-topic, but which do you (Current students) prefer?

I'm somewhat undecided (also an offer holder). I think I'll go for a MacBook, dual boot Windows, and virtual machine Linux. Alternatively, I might get a decent Windows desktop, and a cheap Linux laptop (or something else entirely).