Coolest and strongest shout

coolest:
i am between
the one that summon the undead dragon of soul cairn
and the storm call

strongest:
fus ro dah because knock back and you hit the enemy on the ground

Hmm, I think calling odavhiing to come and incinerate, eat and destroy people is one of the most powerful.

I for one like:

Soul Tear - I mean a draugr death overlord thrall ? That is heavy.
Fire breath - because I am one of those men, who want to set the world on fire. (tweaked dmg)

And I use variety of shouts.
Become etheral is helpfull for fighting modded dragons
Combo of Marked for death and Drain vitality - again...dragons
Slow Time - for catching arrows in midair and shooting them back! HA!
and while dual wielding - Elemental fury

Never used animall alliagance and Kyne's peace.

I'm pretty sure Durnehviir could eat Odaviing

I'd had have to say that summoning either dragon and calling the storm are the coolest but the most effective for me is Ice form as it freezes multiple foes at once and works on almost every foe unlike paralyze

YOL TOOR SHUL!