I'm glad you posted this thread and messaged me about it. As I said, I need to stand 4 boards left with my Massive Damage. That was true when both balls were OOB and when I took the Massive to 320/1000/1200 grit sandpaper and hit the Damage with 320 grit/compound.
They are a great 1-2 punch for THS and league conditions. But if I could only have one, I say the Massive is more versatile and can handle light oil just as well as the Damage, as long as you have enough hand to play a deeper line.
For me, the Massive is one of the most under-rated balls in a long time. It is smooth, predictable, strong -- and the carry is fantastic. The only thing I don't like about it is I put my Damage up on the shelf for awhile because of the Massive. The Damage is also a great ball and it was a gift from BrunsNick to boot!