Cruz.
Cruz is supported by evil billionaires.
Trump is a good billionaire. So we know that there is at least one good billionaire.
But Trump is the billionaire you can trust.
You said (I think sarcastically) "Trump is billionaire you can trust"
My answer is yes, I do trust him. One reason is Mr. Trump's sense of self worth. While Trump is President, he will have a keen sense of his place in history. I would think his goal will be recognition as the best President EVER.
Every one of the others will have the natural politician's goal to amass power and fortune. Trump already has those things.