Yeah, Yariv points at what I suspected, that the Erlang model is a bit more robust. However, I wonder if Scala is, in practice, 'good enough'.

Twitter backend processing was rewritten in Scala.. Though I dont have specific opinion yet about Scala, that is a point to be noted.

While we're at it: the backend of the Facebook chat is coded in Erlang. 1-1.

No peculiar opinion about any of them either, btw.

Either one obviously can be used for a great deal of things, that's not what I'm questioning. Mine is more a question of how the theoretical limits of Scala actually impact its real world usage and in what situations.

BTW, in terms of noting points, high end phone systems having N nines uptime is definitely a point for Erlang:-)