My desktop machine runs linux - currently it's ubuntu, but it over the last ~6 years it's also been centos, debian, and arch. I love linux.
Two weeks ago a started a new job and got a macbook pro. I love it - and am completely surprised by it.
I have not run into a single thing that I could do on linux I can't do on osx.
The first weeks are fine. But in time, you will find little things, that will annoy you. You will find things, that are fine in Linux or Windows, but not in OSX. (Like X apps not working, apps that assume some Linux-specific capability or API not available, differently behaving linker - if you are developer, etc.)
And I hope you don't live in Eastern Europe. The Apple service there is attrocious, even little things like exchanging your power supply can take 3 or 4 weeks. Try using your computer without one...