[falcolas]

IMHO - it has the best windowing system. Trivial perhaps, but it's the one huge thing that continuously bothers me about Ubuntu and OSX.

[simoncion]

Give KDE (maybe on Kubuntu) a try. It's pretty easy to make it look and behave a lot like Windows, and alt-right-drag to resize and alt-left-drag to move windows have saved me like a couple thousand hours in fiddly work.

[barbs]

I'd recommend Linux Mint with Cinnamon for the same reasons.

[eru]

If it's only about the windowing system, you might want to try out a few X Window Managers on Linux. There's more than what comes out of the box with Ubuntu.

(I like tiling window managers like XMonad for example.)