That's a tough one. They both looked to be lip-syncing and not really playing the guitar solo.
I'll say the second one is the fake. Here's why.
1. No woman that hot would like a guy that dorky. Video 1 proves that he could win the love of another man, with a wig.
2. Men hate wearing pastel colors. Men only wear pastels (and play pastel guitars) to make fun of original music videos (vid 1 in this case).
300. Video 2 has no end credits. All real music videos have end credits! FOR SPARTA!
4. Networks.
5. That hairdoo! Should we take him seriously with that thing?
6. This guy told me it was fake.
And finally, reason 248. Vid 2 uses Aqua Velva.