It's the music for me, and then if I vibe with the members. If I don't, I either don't bother stanning or just listen casually.
Also, weirdly enough, sometimes the name of the group puts me off of stanning, like take Billlie for instance. When I first heard about them, all I could think of was Billie Eilish with an extra L (and I HATE Billie Eilish). lol but now that I've gotten over that, I've started to see that they're actually not half bad!