Atma Weapon 1 (on the Floating Continent) was easy compared to some of the other bosses in that dungeon (Mr. 'Throat-Jab' springs to mind).
Atma Weapon 2 (in Kefka's Tower) was easier, since my whole party knew Ultima, and made mincemeat of it in no time.
Ultima Weapon was the toughest for me, because my party was still at lower levels with not every GF and skill available.
Omega Weapon took longer than Ultima, but my party was maxed out with items, skills, GF's, etc...so it was slightly easier than Ultima.
The FFVIII Weapons required a ton of more advanced planning than the FFVI Weapons.
BTW, ever notice that the Ultima Weapons never really are the ultimate weapons? There's always a stronger monster somewhere in the game.
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