If it were me, if size, weight, power consumption or overall cost of ownership over time are factors at all, I'd be looking for a Class D amp that can double down to 4 and 2 ohms best. There may be a general correlation between this and current delivery capability but I would not go on current delivery specs alone.
Then of course, how loud you need to go will determine how much power is needed as well along with all the rest and also most likely how much the right amp will cost in the end.
Then of course, how loud you need to go will determine how much power is needed as well along with all the rest and also most likely how much the right amp will cost in the end.