Hey, sup?

Well, I've recently finished my high school and now i'm searching for a University in either Canada or UK, and maybe in the USA. Well, right now i'm a bit confused about my future (what i want to become, and what to study etc.), so I'm looking for guidance from others who have attended universities or have finished them.

So I just wanted to know, what are some key advantages of your university and maybe some disadvantages. Also, what should i look for in a university. You know, those stuffs... Thanks.