That's a good round-up, Monanumbers. It is easy to get lost in all the detail and to get hung up on intangibles like "atmosphere", "friendliness" or "snobbishness" etc. But reputations are often swamped by the contingencies of the year-group you enter with.
If you find yourself stuck for choice, I would cut it down to the things that are less subjective:
- what is the accommodation like (and can it guarantee accommodation every year, are there self-catering facilities)?
- rents and meal prices
- do the surroundings appeal (do I need to look out on green space? am I going to resent it if I don't live amongst crumbling ruins? And what about the buildings AHAHAHAHAHAHAAA)
- does it meet my access needs?
- is it especially big or small?
- be aware that the PPHs have an explicit religious ethos