The thing I like about this statement is that plausible arguments can be made that both clauses apply to either Trump or Sanders.
Sanders believes his bovine excrement, completely. I personally believe Sanders doesn't know he's economically incompetent, socialists rarely do. He's also weak. He got chased off stage by two BLM activists. Against China, Russia or even staring down the G7 or EU reps? Eh. But promising free stuff has ALWAYS been popular with the mob. Problem is, the mob is fickle. And it doesn't last generally beyond the fiscal year. I think he'd be good as a town mayor somewhere. Maybe even state legislature. POTUS would not remotely suit him well.
Trump I believe somewhere in his soul knows that he's incompetent. But he tries to power through it with bluff, bravado, spouting whatever is necessary. Being able to ignore political correctness is one thing, so long as there's actual intelligence and competence behind the scenes. I don't see it in Trump. On the other hand and to his credit, if you ignore the un-PC rhetoric, his positions not as radical or far out there as the media presents. As much as certain folks think he's the savior of culture or whatnot, I doubt it. Expect a lot of talk, little action to back it up. To put things in perspective, if he had put his money into an S&P index fund, he'd be 4-10x richer than he currently is. Possibly a lot more, as he's likely only worth a fraction of his paper wealth in the real world. He made his money the old fashion way, inheritance and amoral lawyers. Another thing is he is vindictive and extremely hostile to free speech.
Cruz I honestly don't know enough about.
Hillery is probably the most competent person running. She's amoral, if not downright evil, at heart. She'll happily sell out anyone or anything in her path. I like her the least personally of all the top tier candidates. But again, probably the most experienced, pragmatic and competent. Which is saying more about her competition than her own abilities, frankly. She'd probably rock the boat the least in the short term and maintain the status quo with an iron fist, with sops through to her base rather than true beliefs (if she actually has any). Long term I don't think that's good for the country, but I don't see any other candidates with pragmatic long term viewpoint. Our form of democracy isn't well geared towards pragmatic long term decision making.