it depends on the size of the pond? personally i would say super red but arapaima is going to have more of a visual impact, plus the cost of the super red against the price of a arapaima. how bigg is this pond?
arapaima in a pond. like having the lockness monster in your backyard. it would be a waste of an arowana especially an asian one to just see him from birdseye. arapaimas are ugly fish IMO but it would probably look nice in a pond. wow some people for sure.