Which deck is better crystal beast or six samurai?

I think you should run six samuri. They are fast, consistant, proven to do well and overall good. Crystal beasts are slow, weak and hard to beat big monsters with. The choice is clear.

Definately Six Sameria, i have used them both and crystal beast decks are not up for a tournament, they are cards for kids, if you want some real strength then use the Six Samurai deck, or you could just mix some cards like me, just throw in rare and powerful cards and some unstoppable trap cards, but also think about some tactics, i will tell you my best one: you have a deck that takes lifepoints from your opponent and gives you lifepoints, also throw in a couple of cards that give your opponent lifepoints, but before you acctivate any of these cards that give you opponent points, activate a card called 'bad reaction to simoochi' then use a card like 'gift card' that gives your opponent 3000 points, but instead it will take them. do this and you are sure to win. Hope I Helped.

Crystal beasts for sure because I have beaten a complete six samurai deck with my clompleted crystal beast deck(I didn't even use rainbow dragon).

If your definition of complete is what I have in mind, bring your CB deck. Or risk losing.

Crystal beast by far. also save your money rather than spend it on grandmaster.