mbuna are mostly herbivorous so I am sure they would love whatever plants you would like to feed them.
In all honestly, people have mixed success with planted tanks and mbuna. Sometimes they eat all the plants and other times they ignore them. They can also uproot plants if they are not firmly rooted.
Whatever you decide make sure your plants are compatible with the hard water that mbuna prefer. Java Fern and Anubias are the most common recommendations but I have seen some pretty elaborate planted tanks with mbuna that worked fine.
There is a degree of luck to it and you are probably better off putting the plants in before the fish.