It was the option A or gambling against the house is a kind of gambling which are hard to win because the house always has the advantage. They already adjusted their system this way and there is no way for the users to change it unless if they are a part of the gambling team and they will do an inside job. Choosing both types of gambling can be fun though and more challenging.
I doubt Option B is more winnable like what you are saying. Since that was skill-based, expect that more skilled players will engage in that gambling and you will mostly encounter them as you progress. Only a few players will choose that kind of gambling therefore, only those players that know the game will play that game.
You can't expect to always face a newbie on that type of game. They are being mostly skilled and even highly professional.
Both gambling types are somehow hard to win. It's just that once we already gaining profits playing at those, try to take a break and don't get carried away.