Probably Oscar but I don't think it's that far a gulf in popularity if it's measured worldwide.
In the west Oscar of course is more popular because he's a western fighter, in the East Pac takes it and I don't think that's up for debate and no that's not just the Phillipines where he's popular. I vacationed in China and Japan last year around this time, after the Cotto fight and he was quite known there when I chatted up some locals and it went into the topic of sports. I seriously doubt Oscar would be more popular than Pacquiao in the East.