RE: How Can You Tell the difference?
Sounds like you need to do a search on how to properly set up an airplane. I read online and in magazines all the time how a reveiw airplane " Only took a couple clicks to be in perfect trim ". When I read those things I come to the conclusion real quik the guy making the statement hasn't a clue.
To answer your question you need to tune your airplane. Set incedence angles, CG, thrust line, control deflections and expo and mixing. An airplane on your simulatior flys well because the software has most of this figured out already.