Trading and Gambling can double your money fast if you are lucky but is too risky. There are many times to get lose than to get win. For me i suggest not to engage in that because its hard to get bitcoin then you only lose in gambling or trading it sucks.
Trading is still worth to do. but gambling is never.. gambling is 100% cause you loose your money.
in trading you can still earn some profit if you follow the rules and learn properly about trading strategies. there are a lot of people earning bitcoins with trading successfully.
Yeah trading is better choice as far as when it comes to make some profits, gambling is totally luck based and I don't see any opportunity in it to make profits, in fact it is the fastest way to loose money.