I used them both as pos 1 ninjas. I liked them both. People saying that they are bad and only good as supports. I disagree.

Susano'o Kakashi: If you can kill one enemy ninja/clone you can mystery every turn if you are using LM's warrior intent. Meaning you c*ways cc their pos 1 if you are faster. Also your mystery goes through shields and it's a sure hit. His standard isn't anything special, but his chase does have immobile.

Rinnegan Sasuke: Being a pos 1 ninja means that he has a lot of control stats. In most of my matches when I was facing anything who wasn't jinchuriki I had them all chaosed. It really made the game easier. I used him with wind main so every time he stole chakra he regenerated hp too. I had cleanse also to cleanse off ignitions.

They are good pos 1 ninjas IMO. But they definetly deal less dmg as other pos1 would.

As for using them as support I think Sasuke is good for pos 2. While kakashi can be anywhere.