AMOLED. I like it due to:
1. zero uneven brightness, which is a common problem with any LCDs, the bigger the screen, more obvious it is.
2. ability to prolong battery life on a charge. unlike LCD, AMOLED uses zero battery when displaying black color, so by tweaking the display and adjust usage habit, it allows the possibility of real long battery life on a charge.
3. infinite contrast, this is very obvious when you use the phone in the dark... i.e., in the early mornings.
4. beautiful colors, now with best color accuracy as well.
I know there is people don't like subpixel arrangement on AMOLED, but with recent resolutions, it really is not a big deal anymore.