It's not the color...but that's a good theory. The green Hammer Vibe is a good ball for crankers rolling on short THS with somewhat dry outsides...Storm, Brunswick and Lane Masters have balls that will perform just as well, and they aren't green.
I'm not much of a Hammer fan but, I have recommended them to other people who want a good economical ball...along with Storms. Right now I use a Rotogrip Rogue Cell, Lane Masters Big R Bang and a Columbia Scout Hi-flare...and I'm sucking wind since I changed to 15lbs balls mid season...shoulder was killing me with 16's...I'll have my poop together by next season.