How is it better? The older set was able to scout other leads, Spore them and still have the ability to attack. This set outspeeds most leads but, still, it's either locked into a move or doesn't get the KO on it's target as it sets up. Both sets have flaws and advantages but I don't see how it's better :/.
Still, I don't see how this set differs from a regular Choice Scarfer that's leading nor do I see how it's mostly a lead rather than a Choice Scarfer :s.