I'm fairly OS agnostic these days - The apps are the only important consideration I have. OpenOffice, Opera (Flash, Java), Pidgin, Skype, Freespace (for The Babylon Project), Q2, ET and America's Army for games.
Everything else is purely optional.
UAE is all I need for the handful of old games I still love to play every once in a while.
Imho Natami will be stillborn and the rest offer nothing to me.