In simple words - Day Trading

Reasoning: Basically with gambling, you either lose or win but with day trading you can at least wait for few extra days and the market might recover. It is always better to give yourself higher chances and trading already fulfills that.

Another disadvantage with gambling is that you play against the house that not only has a massive bankroll but also has the edge against you mathematically. In trading you are not trying to win against someone, instead, you are trying to read and analyze the market. Gambling is better for those who are sports bettors and know how to minimize the edge by their analysis of the matches.