BrickDreamer

Toa Mata, as they're more iconic, and being the very first wave, less people would have gotten them because it was an unknown theme at the time. Age also has its advantages, as newer fans would want to get the original six.

In terms of sheer power, yes, I agree the Toa Nuva are more powerful, but in a fight, they could easily be defeated by stealing their Nuva symbols like the Bohrok-Kal did, so I would give it to the Toa Hagah.