I had been considering using both in my devoted of sigmar list but i just can't see how the excelsior warpriest is worth the same amount of points. His prayer has less options, he has less attacks with worse weapons and he can't take a warhorse to speed up. Don't get me wrong his model is far cooler and if the gryph hound was free then I'd consider it a closer contest but unfortunately it just seems to me the exclesior warpriest doesn't match up. So i'll probably put him on my war altar to give a cool looking arch lector!
Opinions?