i've never sampled rbr either, or know what it is. You didn't bother posting in any other forums or playing looking around? So i'm not sure if you even tried it.
enthusia-vs-txrd2-physics-handling-comparason-t998.htmlread my post here.
anyways for safe comparasons, try playing a real sim like live for speed and speeding up to around 90 mph with oversteery settings, no body upgrades, without touching the wheel with a logitech dfp or better wheel. Now try doing the same in EPR or TXRD2.
also try turning off abs, and adding stronger rear brakes, and weaker rear tires, in TXRD2 and speed up then brake and see which ones closer. You can say it's kind of unfair since you can't turn off abs and adjust brake settings in EPR.
Neither game is perfect and can't really bounce too much for example, and enthusia does have some strengths, like the more realistic speedo.
Also similar is when you go off the dirt sections to road in TXRD2, your car over steers easily because your front tires gain traction first.