I have two measles balls and two red circles. I can draw two tables with all of them. When I play with the mud ball (fri-sat the bar does not open the tables for me), I can draw just the same. This tells me that they are all roughly the same weight/size. That being said, I do feel they react differently with cut shots and slight cut stun shots. I assume this is related to the balls having different finishes. Obviously the mud ball does not have a nice finish like the Aramiths and I feel it is easier to hold the ball on slight cut shots. I haven't been able to put into words the difference between the red circle and measles ball, but I feel a difference on certain shots. There certainly is a big price difference. I think I like the red circle more, but I find myself using the measles ball more because I like to watch it spin.