depends what you're going to do with it, your budget, however much you want to spend and how much you wanna work.
Quick differences, Macs will be a bit more expensive with the same hardware configuration, and some applications that you would want to run on windows won't run on mac and vice versa. Other than that you're the one buying the computer so it's up to you.
We can answer your questions, and try to avoid bias, but your question is very broad and opinionated.