Both.. that's why they have eventing right?!
I love the thrill of the jump, but there is also a thrill in dressage. I can see that it is boring the the viewer (at the lower levels mostly), but if you've ever ridden dressage you know its much more complicated than it looks!
I am only doing level 1 dressage stuff right now, but I am already hooked. I love the feeling of improving yourself and the communication between horse and rider, you just can't beat that!
But nailing a course or even a combination requires a lot of communication and work as well.
When non horsey people want to come see me ride, I always invite them to a jumping lesson rather than a dressage lesson. It's just more viewer friendly, especially if you've never even sat on a horse ;)
Every great dream begins with a dreamer. Always remember, you have within you the strength, the patience, and the passion to reach for the stars to change the world. ~Harriet Tubman