OP can add their answer but I'm also in the same boat (building chatoctopus.com) and would say Remotion is well-established as a video framework and also has a lot better support for infra/rendering. Rendering takes a lot of time and Remotion's Lambda fanout is amazing for speed up.

Others feel vibe-coded (looking at you hyperframes), and LLMs have to learn their syntax from scratch. X influencer forget to tell you how slow your output would be.