You're asking which is the best Linux distro but feel qualified to tell your friend what to use? Call me crazy, but that doesn't make any sense...
Besides, Linux distros are very much a thing of opinion, you can't tell someone what to use, that'd be like me telling you that [your OS] is shit, you must use [my OS]... you wouldn't listen unless you agreed that my choice was indeed better for you so why would your friend?