PH has value on any fight that adds don't die. If you are kiting adds on heroic conclave, you want the slow. If they get in range you die, etc. Safeguard is on the fence. It's free damage reduction on the main tank if necessary, but also a threat drop. I've had issues with that before, so you have to know when to use it.
Both have their places, if you are apping to a guild, run 2 prot specs one with PH and one without. If you find you need it, then you'll have it and if you find you don't need it, then you can quickly spec out of it. For safeguard, ask them why they want it and how often they expect you to use it. It can be incorporated into a spec easily.