pc or laptop for uni ?

my laptop has just broken and it is a year away til uni, this could be my chance to buy a pc or just buy another laptop. i was thinking of a macbook pro for the laptop and not really sure with the pc but i want it for things like pro desktop, photoshop and cad software, along with online entertainment e.g. 4od. basically whatever i buy i will use for evrything which makes me think about mobility ? say a 13 inch macbook pro may not be as powerful as a pc for the same price but i will be able to put it in my bag without carrying it around, take it out in classes or lectures whenever. just think that sounds easier ? what do you think i should do ? also if i have a pc and dont want to leave it in my flat in holidays it will be a hassle taking it back and fourth on the train so it doesnt get stollen, even tough its going to benefit me more power wise. help !