On substance, I thought that each of them spent their time mischaracterizing everything.
While I largely agree with this, I think Ryan went a bit further with his mischaracterizations than Biden did.
Here is the link to the politifact.com article on the debate: http://www.politifact.com/truth-o-m...hecking-vice-presidential-debate-between-joe/
To test my hypothesis, I'll break down the responses that Politifact checked:
Mostly true: 1
Mostly false: 1
Pants on fire: 0
Mostly true: 2
Mostly false: 3
Pants on fire: 1
Overall, Biden told a lot of half-truths, had two that were at least mostly true, and only one that was at least mostly false.
Ryan had two half-truths, two that were at least mostly true, and five that was at least mostly false.
So, according to politifact.com, my first impression was correct, that Ryan stretched the truth more than Biden did.