Gday,
Lets start some info from scratch...
The Big Deal is a strong coverstocked ball, with a strong mass bias influence. It comes factory Dull, allowing more traction in oil.
The One, was designed with a newer coverstock. it comes polished, but it absorbs oil on the coverstock very quickly. Ebonite believes this allows consistency between shots, as there is no need to wipe the oil off the ball before bowling. It also has a strong mass bias influence. The one won't handle as much oil as the Big deal, however it (depending on same variables) should have more 'backend' hook.
What are you looking for in the ball, and ill be more than happy to offer you more advice, otherwise talk to your proshop operator.
Cheers!