I mean if I was presented with 579 instances in an attempt to join Lemmy I would be scared too. I want to be lead through the dark with one choice. I started off with Lemmy.world but when I saw those .ca lemmings I knew that was my home. I think that’s how most people pick a favourite. Though it is fun navigating the catalogue after you’re in the know. Did you know we had a Bulgarian instance called feddit.bg? I only found it through Lemmy explorer.
Flohmarkt is much simpler to pick through, you have 2 uk choices and 1 European one. But I would think an instance that’s well talked about talked about in the region would be the most successful. I remember using Mercado when I lived in Costa Rica that was our EBay hehe.