You are not asking a simple question, and I don't believe there will be a simple answer. To be frank, even with the terminologies, you cannot expect everybody to understand them in the same way. What exactly is scalability? How are you going to measure it? You ask ten people, they are probably going to give you 10 different answers - all have different focuses. Not to say, a more serious question, do you have any benchmarks, or does anyone have?
You left me wondering, are you looking for solid evidences that Perl are more strong in some areas, or do you want to hear some marketing stuff (without much serious research) - another set of buzz word?