“Best” is very subjective, particularly about Linux.

Are you just wanting to experiment with Linux, and don’t have much in the way of a “tech” background? Do you want a distro that more or less works right away after installation? Then Ubuntu (or one of its many derivatives) is probably the better choice for you. (I personally like Mint).

Are you a power user who compiles drivers for fun? Do you think that starting your PC after uninstalling your bootloader sounds like a cool puzzle to solve? Then you’ll probably find Ubuntu too restrictive.