That wasn't a debate it was an argument. Both Trump and Biden said some pretty stupid stuff, Biden in particular. I would note that from the start, Biden was mostly reciting talking points and couldn't stay on topic for a second. Both candidates seemed unable to give a straight answer to a question but Biden just went off into Left field (pun intended) with his talking point answers that often had nothing to do whatsoever with the question / topic at hand.
Trump was ready to fight and did, both against Wallace and Biden. He even hinted as much a couple of times.
Biden held it together enough to get through the whole thing even as he had trouble making complete sentences and repeatedly stumbled on numbers, correcting himself sometimes repeatedly before getting things right and continuing.
On the whole I doubt that debate changed anyone's mind. There was no winner last night, only losers.