I might be able to shed some light.
I use the BES balls, same distance as starter/unlimited balls.
My buddy (who I play with a lot) uses the Callaway iz balls
He uses the Rapture driver (I believe rated at 252 yards?)
I use he G10 rated at 270 yards.
We reguraly play practice rounds from my tees (he's a TP)
He is always within 2-3 yards of my drives...if I hit 280, he's 278, etc, etc.
I'm not sure how performance is versus our irons though, I rarely know which iron he's hitting.