Re: IPS or AMOLED?
IPS has better pixel longevity. On my old Samsung focus I used to read books online via IE. The little circle menu buttons would always be present in the IE bar and I found that those pixels, due to showing white statically for longer periods of time, started to be dimmer than the surrounding pixels. In effect, I could see a ghost image of menu buttons on the screen.
The brightness life of organic LED pixels is much shorter than IPS.