Yes, Stephen Colbert is a better presidential fit than Donald Trump. Stephen Colbert is very intelligent and knowledgeable. He is also a very reasonable person, and is able to speak civilly with people from both sides. He doesn't have the political experience, but neither does Donald Trump. I also think Colbert is much more likable than Trump, and I think he could get more done with Congress without having to resort to bullying.
It isn't hard to be a better presidential fit than Donald Trump, but Stephen Colbert would be a genuinely good presidential fit. He seems to have a good understanding of the political system, and he's smart. He has a good sense of humor and thick skin, something you need to be either a successful comedian or politician. Donald Trump, on the other hand, doesn't seem to have a strong understanding of the political system and seems overly sensitive and insecure.
Stephen Colbert has a better grasp of what is going on in this country than Donald Trump. Colbert does his research before commenting on any subject publicly. Colbert understands how a government functions and the role it plays in society. However, Trump says anything that sounds good to any ignorant person. He speaks to the people who are uninformed and uneducated about issues that they don't understand.
Yes, in an alternative world Stephen Colbert would be a better presidential fit than Donald Trump because Colbert is an extremely successful media personality and always criticizes famous personalities whenever they are at fault. Donald Trump has voiced racist sentiments and also breeds divisiveness among Americans. Although Trump is a successful businessman, he lacks the temperament needed to be President of the United States.