Can't go wrong with Unrelenting Force, for the same reasons people mentioned above. It became my absolute favorite shout after I used it to hurl Ancano off the icy bridge leading to the College of Winterhold. Ah, fond memories.
Other shouts I frequently use:
- Marked for Death (great multipurpose shout, very useful against high-tier opponents and weaker ones alike if I can't think of any other shout to use)
- Whirlwind Sprint (it sees a lot of use since I very seldom fast travel)
- Become Ethereal (very handy for cliff diving off mountains without dying from the fall, and also for closing the distance between enemy mages.. I can just stroll up to them leisurely, absorbing all the spells they throw at me without even flinching, and then finish them off with a single power attack).
- Aura Whisper and Throw Voice (when doing sneaking missions)
- Disarm (I love this one when clearing out bandit hideouts or fighting other melee NPCs.. I can effectively render 3-4 incoming bandits helpless with one shout, watch them drop their weapons and turn tail.. then I chase them down and kill them, one by one).
