fediverse platform for a schools community network

I am looking to host a fediverse platform for a community of non-tech people. These people use mostly ig and some still fb. These people are from a network of schools which are ideologically aligned with libre software and decentralisation. It will include adults and also teenagers, who mostly use IG. This is part of a plan of a massive migration to ethical platforms. I am trying to choose the fittest fediverse solution to these, also considering that I am not sure how much my home server will be capable of sustaining, so the platform should ideally be as lightweight as possible. I am considering mastodon, pixelfed, misskey and sharkey, and some people have suggested akkoma.

What would you recommend? Thanks!!