You probably used a PC first, they probably used a Mac first.

Use the os you like
That is the only answer.
Never ever ask that question again, anywhere.
If anyone asks you the same question hit them then tell them XTC46's answer.

Also never ask:

What is the best Linux distro?
Ferrari or Lambourghini?
Coffee or Tea?
Why is the meaning of life 42?
Star trek or Star Wars?
What does this button do?
How do I hack hotmail?
Alien or Predator?
IE or Firefox?
Real or fake? Can I feel them?

You are now enlightened, go forth into the world a better person.