Risk and emotional stability. Both have the same structure to comprehend.
There are different games in gambling though, some need analysis and some are just pure luck base or mathematics.
IMO, trading has more emotional stress than gambling. Perhaps being in the industry for long will take away the fun in it while it doesn't in gambling. The entertainment stays especially in sports betting.
Trading became a living.
Gambling was more "risking" and adding excitement to the game.
So it's a no for me as a comparison.