I've argued this point before, but IMO, everything being equal (all four teams are champions/championship contenders) the pecking order is as follows:
1. Red Sox (by a TON)
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2. Bruins (this is a hockey crazed town when things are going well, look no further than the success of college hockey here......BU and BC the last two National Champions)
3. Patriots (they were DEAD LAST before Kraft, Parcells and Bledsoe came swooping into town)
4. Celtics (ironic, considering they are BY FAR the most successful of the Boston franchises. In fact, they are in the top 5 most successful franchises of ANY North American sport)
The New York Giants used to consistently outdraw the Patriots in the 1970s.