I do both most of the time, But prefer trading Bitcoin rather than simply gambling it, considering that trading isn't necessarily a negative house edge game unlike gambling and you can improve the possibilities of profit if you make good enough choices.
Gambling is a game which depends on luck and house edge etc, while trading is a proper technique and business which involves proper study of the coins , graphs and candles and if trading done properly after experience and research,will give you definite profit. There is no grantee of win in gambling.