I think that's what makes it hard to pick, you know? Like I almost wanna say "vive la différence" . . . I think I'd most likely go with later, though, if only because I tend to just accept a slight nostalgia-bias to whatever of an awesome band I personally heard first, not because it's actually better.
Also, it's no great secret that I tend to enjoy "polished and poppy" to an extent (not a Mu extent, but still
). Speaking of, have you heard/do you like My Teenage Stride or Voxtrot?