I think it's a rev rate/friction thing like Hack said. Hyroad Pearl needs friction or a lot of hand to be at its best, and if it's there, it's a great ball, and a great compliment to the OG Hyroad for when the lanes get a little too dry for it. OG Hyroad IS the more versatile of the two, but I find the pearl is better for me from angle because I can really hammer on it at the bottom and it keeps climbing back up the hill kind of like the Hectic, while the Hyroad can tend to be sharper on the friction and "stand up" from really steep angles unless you've got the volume to hit up on it and still get it down the lane.