Spellbinding Eye (Grandia 2) vs. Sexy Beam (Disgaea)
Nyarlie's Dungeon experience has left me fairly partial to SBE.
Pow Hammer (Tales of Phantasia) vs. Lionheart (Final Fantasy 8)
"Stop pretending you're an offensive mage and HEAL, dammit!" vs. "Well, Ultimecia's dead now."
Frog Drop (Final Fantasy IX) vs. Gem Missile (Secret of Mana)
Humor value.
Randomizer (Wild Arms 1) vs. Turn Shift (Wild Arms:XF)
Even not having played XF, this is pretty close just from what I know of XF's Turn Shift. Memories of Hi-Rainbow are too entertaining, though.
Bahamut (Final Fantasy 7) vs. Rakshasa (Breath of Fire 4)
FF7 summon magic was groundbreakingly cool.
Flameria (Lunar: Silver Star) vs. Artem Buster (Shadow Hearts 2)
Joachim hype.
Sky Dragon Slash (Grandia 2) vs. Lightning Stab (Final Fantasy Tactics)
Lightning Stab is emblematic of all that was broken about FFT sword knights. SDS was a copy/paste of Heaven & Earth Cut, and didn't even have a cool voice clip.
Dreaded Dragon (Valkyrie Profile) vs. Tear Gas (Star Ocean 2)
DD has pretty good style, but something about taking down fantasy monsters with tear gas is too awesome.
Bloody Curse(Valkyrie Profile 2) vs. The End (Final Fantasy 8)
The End's brokenness was a bit too obvious.
Geno Whirl (Super Mario RPG) vs. Underpants Dance (Dragon Quest VIII)
Yes.