Trading is better due to Bitcoin having a much more likely chance of going up in price whilst gambling there is always a house edge.
Yup we can't beat house edge, so doing trading is the best and here the risk is less to compare gambling.
Not only with the edge, the way the house put the odds already made profits for the house, trust me. That's why usually if which team got many people bet in will lose that match for sure . One more things, the house always win because somehow they knew the results before the match start.