Two very different styles.
Ryan doesn't come across as having much of a personality, so he appears a bit stiff and cold. Biden comes across as the guy who wants to shoot the **** with you over a couple of beers.
Neither one comes across as the guy you want one heartbeat away from the Presidency.
The biggest problem with Biden is that his constant smiling and laughing comes across as smug and condescending. Seeing that he's had a front-row seat to watching the nation's economy stay in the shitter due to his bosses failed policies, that shouldn't sit well with anybody.