Trade has pretty high chance to make decent profit. It depend on this how wise we are to pick the best option. But gambling is purely luck based so that we have no control it. I think so Trade is more profitable than gambling. Even I'm doing both but will consider to do trade.
Selection wise, trading could be suit for every one, but if we select both of them, then sure we have no need to discuss with each other about trading vs gambling. Because in this way, we could solve the problem, gambling suit for gamblers and trading suit for everyone. But i also think better do both of them.