I don't think another President would have said the irresponsible things that Trump has said but that's the only thing I'm pretty confident of if Hillary was leading during this time instead.
I'm not sure about policy though. What does Biden actually want to do about the pandemic if he is elected?

COVID Timeline - Joe Biden for President: Official Campaign Website
In the midst of a growing public health crisis, the country is looking for leadership, effectiveness, and trusted experience — and that’s Vice President Joe Biden. Joe Biden has been laser-focused on the threat that COVID-19 has posed to our nation and the decisive public health and economic...
