If you haven't seen Vanilla + Brood War cutscenes start here:
http://www.youtube.com/watch?v=_9x7SlpWgogIf you haven't seen WOL + HOTS + LOTV cutscenes start here:
http://www.youtube.com/watch?v=7m3XN56erCEKEEP THIS FIGHT FAIR ! Post up why you prefer!
Personally I prefer Vanilla + Brood War - Short, Simple, Sweet, hilarious, so so classic and memorable. The only really memorable cutscenes from WoL is probably the one where Zeratul Fights Kerrigan in the Xel Naga Caverns and Kerrigan uses some sort of Jedi esque force push to stop him...so homo...where she get force push? dumb.
Blizzard is going Jedi on us man. The death of Tassadar turning him into a Ghost just like Obi Wan Kenobi. Kerrigan doing force Push just like the jedis...derpity derp derp.
K U GO NOW