I like both keepers. They've both made amazing saves.
I would say that the "cause" of conceded goals have predominantly been linked to outfield play.
If our outfield is good enough at attacking and defending, then Carson and Roos have my backing.
Although, I do remember my (unbiased) Brighton-fan friend being unimpressed with Roos' distribution. My gut feeling was that Carson's dip in form was down to a temporary niggle.
They're both good, and they're both different. I wonder if there is scope to rotate our keepers more based upon the opposition, home/ away, and tactics