Dice is the easiest for me, there's no need for deep knowledge or experience about the game because you can easily understand the flow on how to play it.
I can see a lot of players in dices sites even in this forum, some are betting small while some are betting big, this is an easy game where a gambler just wish he will be lucky to win, but there are still people who are challenge with this, making different methods to win although in reality there is no method that will work over time in dice.