Honestly, it's whatever they'll stuff themselves with!
I had a kelberi that would only eat a few massivore pellet then stop going for them. He never grew and I had to get rid of him.
If you're talking about the two you just got, go with massivore and hikari food sticks. I'm pretty sure they'll hit that stuff till they're bulging.
What i'm doing with another cichla is feeding them hikari food sticks till they won't eat anymore of it or aren't as aggressive toward it then I start feeding them market shrimp.