Doesn't matter, since the Sox have the best pitching in baseball.
Here's a list of better active sports rivalries, in no particular order:
North Carolina vs. Duke
Ohio State vs. Michigan
Redskins vs. Cowboys (Bears vs. Packers is overrated)
Maple Leafs vs. Canadiens
Barcelona vs. Real Madrid
and that's just one per major sport. If one wanted to go into more than one per sport, go into the past, and dig through other sports, one could bring up much better rivalries like Ali vs. Frazier, Lakers vs. Celtics, Brazil vs. Argentina, I could go on forever...