I prefere trading, it's the most profitable and it makes the most sense.
Gambling is not meant to make profit but for fun and that is how I treat it, a leisure for my free time.
Binary options are two risky and personaly I don't like it, in fact I find it as a shady business.
For someone who is seriously involved in Bitcoin, trading is the best.
I also prefer trading and holding. It's important for me to be careful and invest with peace.