My statement of it is a wash is both Biden and Trump seem to have shady pasts. No one has the moral high ground.
Yet, when push comes to shove, it won't matter. People will vote for their guy because they simply do not want the other to win or will chose the lesser of two evils. If these allegations with Biden are deemed viable, I highly doubt it will force Biden from the race. For the Democrats, the stakes are too high. If that makes them hypocrites, they will gladly take it if it means a viable way to beat Trump.
For people in swing states that may go over to Biden or Trump, things like the economy, COVID and if you think Trump is an asshole or a greater leader will be the deciding factor.
Just more evidence that people on far ends of the spectrum are idiots.