Zebra, it is usually not a good idea to mix peacocks with mbuna because of different aggression levels (even though labs are not that aggressive) and set-up requirements (more open spaces vs. more rockwork). On the other hand, zebras and labs will cross breed.
Thanks, i think i'm going with zebras.
My mind was on zebras at the start because i've heard they are really cool and i have seen that most of the time they aren't expensive as peacocks.