I think the Lemmy.world instance has very good administrators who have made good decisions thus far.

But as for "who to follow", that's a bit more ambiguous. Its not necessarily important to follow people you agree with... its sometimes more important to follow people you disagree with.

Lemmy.ml IIRC is the Lemmy developer's instance and is therefore important, even if their posting styles do not match what I like to see. I also consider Beehaw.org important, they rub me as snowflakey but I think I respect what they're trying to do (even if I don't necessarily agree with it). sh.itjust.works errs on the other side politically.