I saw this on the BBC One channel (they had joined the BBC news channel)
I don't think Kristen was as good as suggested - Trump always got a chance to reply to what Biden said but a Biden response was often 'trumped' with a '10 second' offer to Trump in order to quieten him - meant that Biden never had 'the last word'.
Trump just lied, expansively, and even when called out just doubled down. Biden was just not a good speaker, hesitant, occasionally falling over himself.
On balance I think Biden did put over all the good points but Trump's loud bluster reduced the impact - I think it was a much more even split than PP have suggested - Biden may have edged it with the uncommited.