Every game is better when you are winning. One thing is assured that you can't beat the house edge, so you are now winning for your good luck only, sooner or later the sakes with red will follow. If only then you can control yourself then you will be the winner whether its a slot or a dice.
You are not wrong but if that is your main motivator and not the inherent fun you can get out of the game itself then dice is way better than slots, the house edge on slots tends to be very high, which is why when you enter a casino probably the first thing you are going to see are slot machines, the casino wants you to play there because they get the most profits and even if dice is as repetitive as it may seem to some offers way better odds so your chances of having a lucky day and earning money increase.