If you’re picking a home team and plan on going to games, Boston is slightly closer by car ( Foxborough is even closer) and imo a much easier and less stressful drive. However, if you dont want to drive I find it easier to get to NY by train from here (either Amtrak, or CT Rail to New Haven Metro north) Yankees and Rangers games actually have trains directly to their stadium/arena. As far as who more people support here, I’d lean boston but its very close