I don't see one or the other as having won or lost. I don't know anyone on bsky and various people on Mastodon, also before joining Mastodon about a year ago, but hear bsky is bigger on the whole. Probably a regional thing, and part of what I seek on this type of platform is local people and news. Heard of an open day of the Effelsberg radio telescope for example, which was a really nice experience and I'm not sure by what other means I could have learned of it (following all places of interest in a large radius separately perhaps? How would discovery of new places work?). It simply fulfills its purpose for me rather than being a "total sore loser"

I also really enjoy the inclusivity features like content warnings, filters, and alt texts. Didn't know I'd want these but it has been super nice around the USA election period, or when videos don't load on mobile data you can just read the text and know whether to bother with further attempts. Dunno if bsky has feature parity there or if people make use of it. My Mastodon instance in particular is quite... I don't want to say strict, but there's a good culture about it