watching this damn gif over and over and just absolutely chewing on it:
what do you seek?
instantly: fortune (expression fairly neutral, even becoming more open after he says it)
then, he looks upward. this is a body language queue for thinking. when light hits the bottom curve of your irises as you look up, it causes a spike in mental awareness. just a little jolt of clarity, to aid recall. people do it instinctively and automatically.
so he looks up, and then he goes: ...and power. (expression becoming more fierce, more insistent, chin jutting, forward movement)
so: he wants fortune (by definition: a turn of good luck in the course of one's life) without even having to consider it, and he either thinks he wants power, or he thinks he's supposed to want power. either way, it's not his instinctual first thought or priority, but it matters to him that power is on the list.
result: darth maul wants things to go better for himself, for bad things to stop happening to him. sidious did everything he could to turn this man into a monster, into an utterly evil abomination like himself, and he failed on a fundamental level. maul doesn't want to rule the galaxy front and center like some kind of evil overlord, he doesn't want a baker's dozen syncophants torturing puppies in his throne room. naw, he just wants to be fortunate and happy. he has no idea how, and his own mind is a claptrap for bad ideas and failed methods, devoid of moral principles, but shit...