What I mean is whatever you choose between the two when you're greedy, you'll end up losing both.
You're right that trading is different from gambling.
But what I am saying if you're greedy to both of it, no matter how good you are, you'll have a direction and that's to the losing pit.
In fact, many people try to justify trading as gambling, simply by showing the logic that if you trade or gamble based on your greed, there is a possibility of loss in both cases.
But what I really want to say here is there any work where you will be success even you are doing that on the based of your greed I don't think you would be show anything. It is foolish to expect success from greed in any field, be it trading or gambling or anything else.