The question sucks but anyway lets answer it .
First of all you cant say one is better and the other one is shit, each one completes the other one so i would say linux+windows!
Linux is perfect when it comes to servers, the security is known to be better. on the other hand there are many application which hasn't been released for linux and are on windows platform only.
Using them both is the best choice for example if i was a gfx designer i would go with mac first and then windows, as a programmer linux first windows second .

each one has its goods and bads.