Well since my TS2010 ACTUALLY WORKS, I think Auran has done the right thing in upgrading the program to use multiple cores, texture compression behind the scene and layers in Surveyor, to give only a few examples. My TS2010 also runs all of my old routes better and smoother than they ever ran in previous versions. This is a straight apples to apples compare, same route, same objects, just different Trainz. And yes, same machine too since I also have TRS2004 loaded beside TS2010. I also had but have since unloaded TRS2006 since that was rather crappy with the then new CM never working properly....
I personally think if Auran/wtfeverFAIL had not leaped light years ahead in doing 2009/2010, and instead focused effort on fixing age old issues, (If you don't know what these issues are by now, you're either new or ignorant), then there would be a much higher level of support from the people since they have a version of Trainz that ACTUALLY WORKS.
...