Yeah, I train for both as well. I'd say power is more important, because, well, you don't really need endurance. What do you need endurance for in a fight? I've never witnessed a fight that takes longer than 1 minute. It doesn't really matter, unless you're high school wrestling or something. But in an actual fight, you probably won't notice yourself getting tired anyway. Also, yes, to a certain degree technique can compensate for power, but if it's your first violent confrontation, you're probably going to completely forget "technique" and be glad you still have power. Power it is.