Hm, what makes a good server? I think for me, I want: not going to disappear, high uptime, low latency, moderate moderation.
You can measure moderation by going to most server's /about page, to see which servers they've limited interactions with.
I'm on hachyderm.io. It's good, but could be better. I expect it will remain at least at this baseline level of quality, so I'm too lazy to search out other options.
My wife is on wandering.shop. I'd say it struggles much more with latency/availability, but is still fine, especially if you use an app, which can paper over some of the latency issues.