While in gambling, risk is higher and if you're in the verge of losing a lot you'll just lean on your luck. There's also luck in trading but it's highly more of analysis and you need to allot your time on it seeking what coins shall have a good future for long term investors. And for short term investors, they need to be on trend looking for coins that moves from time to time but it's also more of a gamble because you have no idea when the trend for these coins shall stop.