I don't know. Everyone always talks about how great Valero was, and he had potential to be a great fighter. But before he went completely bat s**t crazy and did all that s**t, who did he ever really beat prior to the DeMarco fight???
He beat Mosquera, who was a Top 10 SFW at the time. Pitalua was a Top 10 LW at the time. So going into the DeMarco fight, he had two wins over Top 10 fighters.
Broner's beat Ponce De Leon, who wasn't a Top 10 fighter at 130, but still was a huge step up in class at 21 years old, against a very good proven fighter. The fight was close, but it could have gone either way. Broner beat Litzau, who was a Top 10 SFW at the time. Broner beat Perez, who was a Top 10 SFW at the time.
So neither Valero or Broner were really THAT proven going into fights with DeMarco. Both had some decent wins, but nothing really spectacular at all. But I'd say Broner-DeMarco is bigger because DeMarco is more highly regarded right now than he was over 2 years ago and is coming off good wins.