I've played several... "home" muds were wotmud then after that died, shattered kingdoms.
Here have some unsolicited thoughts on each. Wotmud was the hood of all muds. Amazing pk. SK had a pretty weak pk scene but no limitations on pk and amazing rp. Both are sadly now completely defunct compared to what they used to be. Likely true for any mud that's been around but I'm here because it looks interesting and it's nice to have no personal history of glory days against which to compare. CF reminds me a lot of wotmud in some ways. Chasing is important, combat strategy is complicated enough that you can't always tell someone exactly how to get their job done. The combat engines really only resemble each other in that they're both text though.