I've thought about just going one way, getting all the stuff, then grinding back the other way, but I just KNOW that the second I hit exalted the other way, blizzard will add some rewards to the other faction just to break my spirit.
I just spent a little time looking at the Wowwiki page comparing Aldor and Scryer...http://www.wowwiki.com/Comparison_of_Aldor_and_Scryer_rewards
As for reputation rewards, the only things I think I would want for my pally are from Scryer...
Design: Runed Blood Garnet
+7 Spell Damage
Equip: Improves spell critical strike rating by 12.
Equip: Increases damage and healing done by magical spells and effects by up to 34.
But like Mallik mentioned, the quest rewards are much better from Aldor...
Equip: Increases defense rating by 18.
Equip: Increases damage and healing done by magical spells and effects by up to 30.
Equip: Increases defense rating by +23.
Equip: Increases damage and healing done by magical spells and effects by up to 28.
I think Aldor also has the better spell damage inscription, if you're going for maxim spell damage for AOE goodness...
Greater Inscription of Discipline
Use: Permanently adds up to 18 spell damage and healing and 10 spell critical strike rating to a shoulder slot item. Does not stack with other enchantments for the selected equipment slot.
Luckily, I can get the JC recipe from Scryper at Friendly, then switch over to Aldor I want.