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There is a second advantage to two-piece rotors that use an aluminum hat section - The aluminum hat section draws heat away from the rotors faster than the iron hat section of the one-piece rotors.
Aren't the 2 pc. rear rotors (at least Eradispeeds) larger than stock? I just bought the one piece Eradispeeds because I don't care for the 2 -tone look on the rear rotors caused by the caliper/pad only wiping 1/2 of the larger 2 peice rotor.
The rear 2-piece Eradispeeds are larger than stock by a big margin. I would recommend 2-piece for track and high speed use and for looks, if you want to pay extra for it, and one-piece for street and lower cost applications. They all work fine on track, but the 2-piece have a definite cooling and weight advantage.
We have a ton of different options and can advise you as to which might be best for you. Visit us online and let us know if you need help. We track test just about everything, so we can tell you what will and will not hold up to severe use.