You've been away from the area too long. Cubs-White Sox discussions are less than civil. And seeing as the Cubs are seemingly the only road team that draws at Comiskey, they've gotta count for something.
I'd say the Cardinals and Astros are the primary rivals for the Cubs, with the White Sox #3. (I'd rather see the Brewers be our #2 rival and let the Astros go fuck themselves in fifth place, but such is life.) To hear some White Sox fans, you'd think the Cubs were the main rival above the Twins and other AL teams.
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Really? It got that serious? As for the Cubs drawing in Comiskey...well it's easy for Cubs fans to make the 20-60 minute drive to Comiskey to watch the Cubs play there. I would think the White Sox's main rivals were the Twins and Indians, with the Cubs at #3.