Impossible question. Different things appeal to different people. Why not try a few different distribution to make up your mind which one you like best rather than relying on any sort of ranking list? It's easy enough to find the main distributions if you do a little Googling.
If you tell us what you want out of an OS, what things are important to you, what your level of computer expertise is, it might be easier to make a useful recommendation, but it's easy enough just to try them out. It's all free!
There are many hundreds of Linux Distro's...and many of them are worlds apart and different from one another. Your question is extremely stupid...no offense but it really is. Your question should be, what is the best Linux to fit your hardware, expectations, level of experience, and purpose.