One meta-observation: given the emphasis in Valley (and YC) startups on "rockstar hackers", I am surprised that most replies so far tend to favor candidate B.

One meta-observation: given the emphasis in Valley (and YC) startups on "rockstar hackers", I am surprised that most replies so far tend to favor candidate B. Maybe it's because the PST workday is just starting and the advice so far is more east-coast :p