Damn fine question.
I'm here partly because it seems to be the most active instance. I also don't hate all the assholes that like to mute nonconformists. I actually like to hear some of their output, and often find myself in agreement. It would be nice, though, not to see so many random ideological digs and parroting through threads. It feels like the same brain constantly high-fiving itself on repeated hot takes.
Most importantly, though, I want to leave Reddit. I certainly had similar complaints there, but not to the degree I've so far witnessed here.
I have accounts with a few other instances. They're all federated with Lemmy.world, and it seems the most active communities stem on Lemmy.world. Posts may not get blocked as often on other instances, but the echos still lean deep in one direction or another.
Just my observation so far.