I've had both the Pumpkin and the Blurple and the Pumpkin was a little smoother. That being said, the Blurple is one of the smoothest pearls I've ever owned. Not a ton of backend snap on mine and it handles a good amount of oil as well. As stated, drilling and surface prep will affect how smooth you want either ball, but if I had to recommend just one, I'd go with the Blurple. If you can afford 2, then go with both. Add in the Ogre Particle and the SS and you got a fine arsenal that will compete with anything out there! Just my opinion...
Spike