honestly I cannot tell the difference. Do you understand that no matter what screen size you use in C2, and if you set it to fullscreen, AppMobi still scale it to about 60% of its original size. So unless you have a High DPI then things wont look as good.
Couple of questions that I think are the problem.
In C2 what window size are you using?
In AppMobi, what device are you testing on?
What DPI are your graphics?
If you can answer those then I think I can help