I think that's a hopeless argument.
ORO has a developed pipeline of projects.
DMN has Mt Barrett and the two other Gold projects.
ORO has lower risk in terms of returning a profit. That said, they have less to gain.
DMN has much higher risk, and a much higher potential profit.
If you can afford it, buy both. Otherwise, decide whether you are willing to lose it all on DMN or not. If you can't handle that risk, buy ORO.