Donald Trump presents numerous threats to our collective survival as a species through judicial nominees, a lack of environmental policy, and acceleration of the neoliberal decay into fascism. Joe Biden is essentially the exact same in terms of policy, but a hair's length better on the environment.
That being said, Biden would also embody the American "left" and would result in the Republicans moving further Right as a means of appealing to their base. Unlike Trump, Biden knows what he is doing, which can be seen as good or bad depending on your perspective.
So which is a greater threat? Both are unadulterated evil and represent the interests of the capitalist bourgeoisie. Let me know what you think with your answer to the (Pokemon Goto the) poll!