I'm AD playing on sotha, eu/pc (since launch) and favourite experience in cyrodiil is the wide spanning skirmishes involving high volumes of players in non-Zerg formation that usually takes place between sejanus and BRK, and Nikel/Ash.
These battles are the closest experience I find to pvp back at launch with no zergs, trains, bombs. Simply large scale battles, fighting all around, yet within this your always kind of 1v1ing or 2v2ing.
Don't get me wrong, taking keeps can be exciting, bridge fights are ok, and small scale pillaging deep in enemy territory can have its moments, but my fave play style is as described above.
What's everyone else's?