Let me give you a run down, of my opinion between these options.
first is first, you came to the right forum
Mac's are amazing for Adobe products, although Macbook, iMac's are to expensive, personally there WAAAY over priced.
Surface Pro 3, I personally think is awesome! comes with a USB port and everything, but it also carries a price tag.
I would always recommend building a PC, there a few ways you can do this, there are few cases in the corsair line up that you can build
a PC and carry it and plug it in typical VGA,DVI,HDMI, usb ports and monitor at your school.
But also the other alternative is to buy a gaming laptop.
There's many ways you can do it, but when your building a custom PC you can use a mini itx form factor and still use it and carry it.
Bottom line:
Macbook's are really nice, but overpriced Adobe products need more than 8GB RAM 16-32GB the more the better for editing.
custom PC's you can go crazy, but you can also go budget and have enough under 600$ for a good editing PC
Laptops (custom) (alienware etc) your able to carry it and edit the same time.
It's truly up to you, but choose what you think is right.