Cariba Or Natt Tank?

In the near future I plan to set up a 125 gallon tank, with either 5 cariba, or 6-7 natts/red bellies. I would be feeding a mixture of frozen shrimp, fish, squid, and octopus, and if I can cichlid pellets. I would like to a have a moderately planted tank, with a high current. I also like some activity in the tank. Which group of fish would be most interesting to keep, I know you might say cariba, but what are some positives about natts too. And which would you say are more active, throughout their life. And how active?