Pindi facing and margalla facing is just a way property dealers turn both facings into a positive aspect. One is better because of the sun, other because of the view. I'll just list out a few positives and negatives universally (well nationally) accepted:
Positives:
- levelled (if you don't want to construct a basement)
- closer to main boulevard (on boulevard is the best)
- located on a bigger road than usual.
- close to a commercial area
- close to a mosque
- park facing
- south facing
- height, compared to others
- corner (specially if you can have two gates on each sides)
- more than one side open
- closer to water tank
- extra land around the plot
- approach/distance from the community/colony gate
Negatives:
- closed to high tension wires
- in front of commercial (it overlooks your house)
- in front of or very close to a school
- area in depression
- 'khadda' plot
- filling
- cutting
- odd dimensions / irregular shape
- close to a drain water nullah