My favorite shouts would have to be Summon Durnehviir and of course Rii Vaaz Zol (Soul Tear). Besides, after using Soul Tear to finish off Ulfric Stormcloak, well...I can't deny it's incredible power after that.

Fire breath makes me feel awesome

I wish we can use fire and frost breath like the dragon use like a flame thrower it will make the shout much more useful.

Also the cool down for so e shouts is way too long. Even fire breath shouldn't take that long to recover after using all 3 words.

Regardless my favorites are.

Fus Ro Dah
Frost breath
Fire breath
become ethereal
Wirlwind sprint
Storm call
Ice form
Summon dragon (either one)
Soul tear
Elemental fury

none

Fire breath

Fus Ro Dah, Fire Breath, Slow Time