Trump is doing nazi dog whistling and his cabinet members will be less competent and probably have worse traits like some of them thinking America needs to be a Christian state.

I think federal spending on things that directly help people will be higher under Biden [source I made it up]

Trump actively spreads a message of hate and intolerance by telling his fans that minorities are bad, so giving him a bigger platform would be a bad thing

Those are some of the reasons bouncing around in my head of why trump is worse