N9?
4" screen (my eyes are old and the N900 is just too many DPI).
Fast... much faster than the N900.
Storage... isn't it obvious?
Keyboard... I am completely unimpressed with the N900's, and this one has (had) a very nicely laid out keyboard (in comparison).
I'm sure there's lots more, but I'm amazed the question was even posed.

MeeGo?
Well, Maemo is dead, MeeGo is its more open progeny, and has the development teams and support of more than one company.