I explicitly took that into consideration. Just run around with Meteor on flashbang and study how often it actually hits. Most of the meteors miss unless the target is quite fat. Even the lucky scenario of 3-4 meteors hitting a target every proc (i.e. every 3 seconds) is laughable.
(Devastation has a higher impact radius and a tighter target area. Perhaps that’s the buff shower needs for reliability…)
The momentum comparison doesn’t apply because you only get 1 shower out at a time. 6 Leviathan pools stacked in 1 place is a death zone that deletes trash on contact and noticeably drains boss HP. Even without the summon loophole, Leviathan’s reliability puts it on top against anything that’s not C’Thonian/Undead Nemesis type enemies.