I actually started on Kbin.social, but then it got shut down, Kbin died and now fedia.io seems to be the largest one running MBin. I like the interface on MBin and I guess it’s good to have a diverse fediverse with different services, but at the same time, why use mbin when everyone congregates on lemmy instances? The local magazines on fedia are for the most part, quite dead, when compared to lemmy collections. In the end I feel like there aren’t enough people to go around to support many more services like MBin and Piefed.
When I started, I picked Beehaw on lemmy. I hated the autorefresh and some other settings (around language IIRC, but it’s been a while) not saving and/or not working. I went to kbin as a result. I know lemmy no longer autorefreshes in newer versions, but I just got used to the layout and feel of mbin.