I need the laptop mainly for my studies
What do you study?
and later work Graphic Design (Photoshop, Illustrator) , Video Editing (Sony Vegas, After Effects)...
Macbooks work notoriously well with the Adobe suite.
I'm looking more into portability while maintaining performance
I'm not sure I understand what you mean by portability. Do you mean mobility? (portability means something completely different when talking about computers).
Do I give up on buying an expensive Mac and rather buy a high performance Windows notebook for half the price?
It depends. What do you need the extra performance for? Performance is not only about the numbers shown by your processor vendor. If you want to do Graphic Design as you mentionned, MacBooks will be far more performant despite lower specs.
Your question is too broad and is unlikely to get a relevant answer. You're asking us to confirm that MacBooks are better for you. It seems to me that you have your mind made up already. Dare I say Mabrouk? :)