Im a Level 66 RLB Archer in Carnac-West. I have both of these bow's and I do fairly well. I am currently trying to get 69 but other then that I pk once and awhile.
My Pro's and Con's:
Iron Bow +7: Stronger then a Enion Bow, but has less elemental damage and doesn't help with the poison damage(but it helps poison the enemy with Viper Shot or w.e it is called.)
Enion Bow +7: Less AP then a Iron Bow, but more elemental damage and gives the strength to hold more pots which I rely on. It also gives me a better chance of stunning my enemy's with Lightning Shot.