I'm deep into the discussion, but needed to chime in. I was browsing on my phone and didn't want to short change my response, but weirdly I was just thinking about these things the other day, with my baseball team heading into postseason and my football team gearing up for a huge year, following a chip in hoops.
I have definite favorite teams in most sports, but not really the NBA. Basketball, college specifically, is my favorite sport. So UConn, since 1994/5/6 range, has been my diehard follow every season and off-season. The only thing that can compete is my Buffalo Bills fandom. I'm way more a fan of college basketball, but I think my home town allegiance and attachment to the city gives the Bills 1A status. UConn is definitely 1B and the Braves are a clear cut 3rd, but still in my top tier.
After that, I have a second tier where I'm still pretty strongly attached, particularly when things get into important games, but not quite on the first tier level. That would be Buffalo Sabres hockey, Florida State football, and different teams in the NBA in different eras. That never lasts because it's usually tied to my favorite players, usually Huskies. So from 2007 - Kemba was traded, the Celtics were my NBA team mostly. 1990s I was all Hornets from Mourning until late 1990s. My NBA allegiances are more tied to UConn fandom than anything.