Replying to What is better for me? mac or pc

ive used the search bar, and it was helpful, but i need to know what is better for me.  Im not in university yet, but hopefully will be in a year.  I currently have a hp laptop and like itm but my sisters comp broke and so im selling mine to her.  i dont do alot of photo/video editing, I just do random stuff, school work etc.  i always wanted a mac just because they looked cool, but now i want to know which i should go for. one of my teachers said that mac's arent as good cuz its mostly all external( dont know what that means). also, if im going to get a pc it will be a laptop, but if i get a mac, should i get teh macbook or imac? i was liking the imac but im thinking about university and shit, and what would be better for school?