I'd say that any debate involving Trump will have the overriding element of petty attacks, fact distortion, and name calling. It probably applies to both sides, but may go back to the old grade school "he started it" excuse. Inside of that there will probably be some discussion of the issues. For the general public, there is a lot to be said for optics and personality, which we already know about Trump, but less so for Harris. And there's always the chance one or the other will say something totally offensive or condemning for the media to pounce upon.