I need a faster machine
What have you got a G4 mac because id say on the whole macs are the same speed now.
Ive used both and macbook pros run xp and vista just as well as any other laptop. ok i know they are expensive but its only like the premium sony or other companies put on their domestic goods, just for the name. plus OSX is more stable in audio recording ive used quite a few programs on PC and nothing is as stable as my friends Logic setup.
Its really is about what you want the system to do, games is a easy choose it has to be windows. but 3d rendering / animation or video or audio id really edge towards a mac pro. the quad core Mac pro is almost £2000 but for rendering detailed scenes with complex lighting is so quick it has to be seen to beleaved.