If I've already been using Arc for a long time, is there any benefit of moving to Zen? Active development, I suppose?

Was a big fan of Zen. Alas! Lack of compat with Google workspace (eg sharing audio for a single tab on meet) meant it did not stick.

So I also use and love Zen. That being said, the "every window's tab list is kept in sync" feature they introduced is... odd and really annoying imo.