Isonzo is the newer one. I haven’t played it in a few months, but it’s similarly small but I never felt close to anyone there.

I play Squad fairly frequently, and it’s got a similar feel to what the OP is about. You choose your server with a server browser, and it’s frequently got a lot of the same people there all the time. There’s some servers that are more casual, and they end up cycling players more so you don’t recognize anyone. The more experienced focused servers draw from a much smaller group though, and they play more consistently.