The Rival is beneath the Resurgence and the Momentum beneath the Rival. I have both the Resurgence and Rival think that they compliment each other very well. I used the Resurgence on heavy oil conditions and the Rival for medium oil. I used my friend's Momentum and was impressed with it. This ball gets down the lane very well and makes a u-turn in the back. The pins action is great. If I had to choose from either the Rival or the Momentum I would go with the Rival because it' more versatile. The Rival can handle heavier oil by playing down and in and the Momentum is a sensitive to this type of conditions. I wouldn't mind ownin all three. Good luck.
