What are the advantages of Flame Strike over Fireball

Outside of the classes the spells are available to, what is the advantage to using Flame Strike over Fireball in A D&D 1st Edition? Many of the advantages I’m used to seeing later editions (mixed damage type, lack of treasure destruction) aren’t apparent in the original version of the spell. It may be that the only advantage is that Flame Strike is castable by Clerics, which may be an acceptable answer.

What advantages, if any does casting Flame Strike have over Fireball?