The latter. Seedboxes are becoming more popular these days, which might be good for future torrent preservation. But if you have a niche or old school taste, you are gonna have a hard time without port forwarding.

Torrenting, can reach more peers. Especially helpful for older, less popular torrents.

You can just connect a (local) Git repo to it and store your compose files over there. There should be even an auto-sync (if you’re into that kind of thing).