We have the measles balls, but I've ordered a Centennial cue ball and the Predator Arcos cue ball. I will try to determine the best cue ball. I already know the cue ball (no markings on it) from the Dynasphere Bronze set is better than the measles, more spin, draw is about 50% better, but I love the markings on the other cue balls to play with.
There is no way you are getting 50% more draw with any of the good quality cueballs without a lot of stroke variance taken into account. Only time you get that much extra draw is with a cueball that is too light for the set or out of spec. I play with both the Aramith and the Dynasphere cueballs weekly, the pool hall I go to has both sets and I grab them at random, there is just about 0 difference in how they react. In fact from the players that used both sets they feel the Dynaspheres play heavier (I don't but they do).