I read that it is easier to level as a retribution paladin because of its greater damage output but I haven't found this to be the case. As a protection paladin I can kill or almost kill mobs of equal level with this opening exorcism, avenger's shield, judgment. If they get close enough I can finish them off with crusader strike and my normal attacks. As a retribution paladin I had to go with exorcism, judgment, one or two crusader strikes and one or two autoattacks. Provided I can more or less gut the next one with a templar's verdict but it doesn't seem as efficient. Wrath of the Lightbringer makes this even more evident.
I'm still wondering though if I can still level up faster as a retribution paladin. I keep reading articles that say that one should level up as a retribution paladin because it is faster. I followed the tips of those who insist that players should play retribution to level (picked up the biggest, baddest, and slowest weapon I could find, focus on DPS stats, etc)but I just don't see leveling in retribution as efficient as leveling in protection.