To be clear, I think both of them are frauds (though one a lot more than the other).
If you’re being crushed by debt, following Ramsey’s (frankly commonsense) advice would probably be beneficial. If you have any other situation, his advice is going to be harmful to you. Especially compared to the advice you would receive from a real financial advisor, which Ramsey isn’t (though I’m sure a lot of his followers would be surprised to learn that).
But if you follow Kiyosaki's rules, you could be in prison.