I can only choose one type because I have many other fishes already. 10 tiger barbs, 3 blue gouramis, 4 siamese algae eaters, 2 BN plecos, 3 kuhli loaches, and 1 red tailed shark. So I can't choose both. But I think I'm going to go with the rummies since I really like watching fish school. And cardinals are a bit.....dumb in my opinion. They look nice but they seem to be brainless.