It'll be close.
Biden is favored. Trump knew he'd be tough to beat way back last yr when he was looking for dirt on him in Ukraine. If Trump wins, he'll barely squeak by (again losing the popular vote).
The chances of a Biden landslide are much greater than a Trump landslide (which is almost zero), but I wouldn't bet on a landslide either way.
As in '08-09, the depression stage is already set (the economy is already "shocked") before inauguration day. In my opinion, pandemic mismanagement greatly exacerbated it. What matters is what comes next. Fiscal spending is the only thing that will counter the massive deflationary pressure. Monetary policy is exhausted, so fiscal is all that's left. Large spending plans by Dems may be the only thing that counters the deflation, like it or not. In that scenario, Dem control is good overall to keep us from a Depression (Herbert Hoover's austerity led to Depression, FDR went the other way...)
If we do get out of it, then inflationary winds likely greet us on the other side.
Either way, it does not look like the 2020s will be a smooth ride.