The AI in Deadly Combat is also better in my opinion. For the most part it's very similar to Deadly combat, but the staggers from Deadly Combat are better for sure. Ultimate Combat is alright, but the unique features of it can be gimmicky, like the NPC special attacks. And you can use both alongside each other. But I think you might be able to use SkyRe_Combat standalone. Of course, this assumes you are using SkyRe. Let me first say that using the SkyRe combat module, which also uses a stamina cost for swinging, completely alleviates the Con in Deadly Combat with the low stamina cost for swinging. I have used both Ultimate Combat and Deadly Combat.