For me, the Rattler started up a few feet earlier than the Loaded does, and had a more dramatic change of direction when it hit friction.  The Loaded is clean through the front part of the lane, and a bit less responsive to friction.  As such, I can play closer to the friction with the Loaded, and stay with it longer as the condition transitions.

For me, the Massive starts up a touch quicker than the Rattler did, but is sharper at the break without being too "flippy." The best way for me to describe the Massive would be that it has an Anaconda look for about the first 40 feet, and a Damage look in back. It has that nice defined break, and it goes through the pins really well.

 

The way my bag is set up right now, I've got the Massive and the ulti-max to give me two different shapes for mediums, and then the Loaded as the "go-to" ball from there, because of how clean it is in front and how it doesn't over-read the friction.