What Heracross said. The Japanese openings are much more thorough, more creative, have better music, and feature much higher quality animation. 4Kids, in their desperate attempt to squeeze a minute and thirty seconds of opening sequence down to a mere thirty-five seconds will often run certain scenes at twice their normal speed. The worst offender in this area is likely the American version of "The Challenger!" used in Season 7 - Pikachu shocking Hariteyama, the sweeping shot of the main group on the hill, Oosubame flying in front of the camera, Musashi-tachi and Sonansu flying upscreen, and Masato tugging on Takeshi's ears are all sped up to an almost obscene rate. It's much more comfortable to watch these scenes at the rate of 24 frames per second like they're supposed to be.
