Soap: Characters personalities are in conflict. Social occasions, conversations, interactions and gossip are the major battlegrounds and weapons, escalating into assassinations in space, wars and exploding things.
Ideology: Characters ideas are in conflict. Forum debates, news articles, are the initial sources of disagreement, escalating into wars and shooting.
Power: Characters economic, military or other material goals are in conflict. Parking your tanks on someone else's lawn is the start of things. Wars and explosions soon follow.
I would say that mostly, it is the ideology that I like more, when there is enough PF to make it interesting. E.g. the difference of opinion with the Sani-sabik space nuns that led to the Doll Wars, and the interpreting of Scripture that I engage in with some of the more traditional Amarr characters. I also like a bit of soap from time to time, depending on the characters involved, e.g. when I took various people shopping for things for a social function.
What do you prefer doing?