In my opinion
Trump hasn’t performed well in any of the debates. In the second debate he did do a good job appearing gentlemanly by apologizing for his comments and giving Hillary praise.
By not performing well I mean Trump hasn’t presented his policies as clearly (more like not at all) as Hillary. Hillary obviously prepares for the debates beforehand as all her lines sound good and scripted – but Trump’s improvise-style seems to pull (or dumb down) the debate into a dimension Hillary didn’t prepare her. Trump didn’t leave her speechless much but he did elicit a lot of gawky expressions from her. Count how many times Hillary the professional smiled like an insulted teenager in an internet fight.
These are just my observations and frankly I don’t like either of them. I like Pence more than Kaine though.