I think Biden will win over Trump for the reasons that I think people can see through Trump's general incompetence as well pretentiousness, which overtime developed a lack of respect and confidence in the man, the impeachment didn't help him either.
Biden would be smart to take with him a woman like Kamala Harris as a VP running mate.
She is super intelligent and highly educated holding both a law and political science degrees. She is way smarter and better educated than either Trump or Biden.
Add in the fact that she is a person of color (Indian Decedent) which at this time in the US might create even more general appeal to the broad scope of the population.
A quote from Biden .....
Last August Biden said he was open to choosing a person of color as his running mate, suggesting it might be his preference. "Whomever I pick, preferably it will be someone who was of color and/or a different gender, but I'm not making that commitment until I know that the person I'm dealing with I can completely and thoroughly trust as authentic and on the same page [as me]," he said.