

Assuming your group has a considerable amount of non tech savvy people, I would suggest Friendica just for the familiarity, since it’s supposed to be like facebook and it would be easier for people to use. I don’t know if it has groups though. You might also sacrifice admin/mod capabilities. I’m not familiar how good friendica’s admin tools are (if any).
.zip has the closest instance policies to .ee. A lot of .ee refugees moved there (me included). Some also moved to piefed if you’re considering that.