I´ve tried Ubuntu for some time, then I switched back to Kurumin, because it crashed a lot in my machine. I can´t say it was an experience I would recommend to my grandma.
I think Linux is too much tied to the command line, and this is something I believe should be left on the past. Looking from this side, Windows is more friendly.
The last Mac I had used OS9, so I can´t say anything about OSX at all. Except that it looks nice ;-)
But anyway, I still think Workbench was the best in my opinion. Of course, we all know about the technology gap caused by not developing anything new all those years. This still doesn´t change my mind.
So I agree with them, let Linux looks like WB. This is something my grandma would use :-D