IOS/Android Device orientation (pitch, yaw, roll). Is it better with accelerometer or gyroscope?

First of all if you don't have a huge installed base of 3GS users but write a new app, don't care about old hardware. IMO it doesn't make sense from an economical point of view but will shrink your number of alternatives in system architecture.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.