We've had the discussion a while back here in selfhosted. You can find it here: https://awful.systems/post/5029223

Main points: Continued drama around people, and tuwunel is programmed by a single, (paid) developer and I figure once there's anything wrong with that, tuwunel might die instantly. While continuwuity is a community effort and maybe that's a bit more sustainable. Though I don't own any crystal ball and I don't know how things will turn out.