My favourites (so far):
4 Flame/4 Lightning. Much better than 2-3 Flame/Lightning. More hits, last longer, and when used on the ground (can be used in the air too) the last hit launches enemies. Low sword gauge per use can't hurt.
Earth Hornet. Can be used in the air or the ground, mashing the attack button makes it last longer (yes, this extends the invencibility frames too) and go farther. Excellent in combos, against airbone enemies or if you just need to become invincible to dodge something.
Gale. Spinning moves are great, and Gale is the best due to being able to move while spinning.
Tornado/Giant Tornado. Probably the best crowd control skill in the game, good damage too.
Flash/Haze. Lots of damage, but crappy accuracy. However they're good against big targets (like most bosses).
Ghost Blow. If I need an accurate ranged move.
Universe. Too cool to not be mentioned.
