Trump is coherent, composed and focus... however the subject matter is ignorant, stupid, dangerous and centered on upper class white people. Biden stuttering and sounds old, as far as what he is saying it's more or less the same as any other REGULAR politician. Biden at least will take the advice of people around him.
Both are too old, but Trump isn't a politician just like he wasn't one in 2016, he does things with the drop of a hat and what he wants to do, not on the advice of anyone.