I don't know what "more consistent" means, but it's usually true that adding particles to a reactive ball tends to smooth out the reaction. Given two otherwise-similar balls, one with, say, a PK18 cover and the other with PK18 plus particles, the particle version will be earlier, smoother, handle more oil, and be less susceptible to carrydown.
That's not to say you couldn't have a really angular particle ball (my Yeah Baby, most people would say the old Phenom Unleashed was pretty angular) or a really smooth reactive ball (solid Ogre, Frankie May). But all other factors being equal, and they rarely are, adding particles smoothes out the reaction.
SH
