I've met more pilots that have flown the Brasilia than the Metro.
I would never poo-poo the Metro, but from what I've seen already, any person you talk to in the pilot world thinks it's enough to have flown single pilot 135. Nobody ever says "If only you had Metro experience..." The 135 single pilot time says your decent enough stick, but specific airplane hours matter to companies that have that specific airplane. Nobody will question whether or not you're a good pilot if you've flown the Metro single (plus Korean) pilot. But why shouldn't the 99, 1900, or Bro be any different?
If anything, the 1900 and the Bro give you hours that are applicable to a greater number of operators. Just my opinion. I still think the Metro is rad and I'd love to fly one someday. I just think that if you're playing the What's-the-most-ideal-path-to-career-perfection game, the argument for Metro time specifically is a weak one. But the airplane type is probably much less important than who you know.