Check out the epic items at Exalted, there are some nice rewards that will last you through T4 content (spell damage ring/fast dagger with scryer, or slow sword/mana regen neck with aldor.) Other than that, scryer shoulder enchants are more pvp oriented (crit > dmg/ap) while aldor are more pve oriented.

It doesn't really matter much in the end. I picked Scryer because their rep items are consistently cheaper on the AH than Aldor's .