trading is way much better than gambling. it is like trading is earning while gambling is wasting mostof the time. and there is no comparison between trading and bitcoins because what you are trading is the crypto currencies itself such as bitcoins, altcoins and other coins.
Trading and gambling have nothing similar in my point of view. Some people say that both are risky so trading is a gambling. That way, our whole life can be considered a big gambling game. Never know what is going to happen next, anything can happen anytime because future is unpredictable but accuracy can be developed in nonrandom activities like trading. Casinos games are luck dependent as most of them are totally random.
actually there is a different definition about gambling itself , in general gambling described as wagering something to get a gain or a loss. but specifically gambling are about wagering money (or anything that has value) on an event to get additional money.
trading basically wagering money too and when you correctly make a prediction you will get additional money , it is up to you to consider as whatever.