Any epic survivors worth keeping?

I have enough legendary and mythic survivors to fill all slots (currently are) but I was curious if there were any specific epic survivors that I should keep an eye out for or if I'm good to recycle them all. I don't pay attention to the survivor squads as I just have it set to autofill. Unless I do need to pay attention to min max my squads :/
For perspective of my progress in the game, my PL is 76 about to do SSD lvl 4