I think I'm gonna go with Cowgirl. I really enjoy being able to focus on the sight.
And while I have my hands free, I can spank her or grab her breasts. I really like Missionary aswell though, because I enjoy the mental component of being on top; it gives a sense of power. Plus, I feel really intimate with my lady.
They would've gone hand in hand as equals, but I always require a lot of effort to climax while on top. It's something I've been trying to work on, but I don't mind rolling over and being ridden to heaven!