I chose the Scirocco. I lost a mule deer after shooting it with a 140 AB from a 270 at only 50 yards. We tracked and trailed it for 3 hours. We kept jumping it and ultimately watched it go over a hillside about 3/4 mile away. I hit it perfectly, knocking it on its ***. But when my brother showed up about 5 minutes later, we were approaching what I thought would be a deader'n hell deer only to find it jump up and run off.
I still use the 200 AB from a 300 RUM as well as a 180 Scirocco. I've killed one black bear with the 180 Scriocco from my .06 which I think I mentioned before on another thread at less than 10 yards and it blew right through the shoulders dropping the bear intantly.
Both are great bullets and after talking with the lady at Swift, I'll be trying the new Scirocco II very soon.
Also, and sorry if this is a repeat, but on the Barnes TSX DVD, they demonstrate the ballistic gel damage from all of the bullets tested and the Scirocco was very impressive, a 180 from the 300WM.
But, the AB is much easier to get to group quicker in my experience.