S60 is a platform, Symbian is an OS

And you're right about the development, its hell!!!!

I just want to add, the J60 isn't as good as the Android's Java environment (not even close), and it carries the penalty of the J2ME slogan write once test everywhere (to the point where different open S60 devices will behave differently)

Symbian week point is its development environment, I imagine they will have to respond in that front in the next versions.

Right. But they do seem to be trying to move in that direction somewhat. I'd consider them Android's greatest rival.