For me it depends... If I dont really have a 'bond' with the girl, doggy style or me on top (missionary) is my preference... It maximizes my pleasure and give me complete control.

However, the ultimate (and only for girls I like) is her on top. I'm a pretty 'aggressive' guy in life and I usually always have my guard up... But to be able to let that guard down and relinquish control... It's a very emotionally pleasing feeling to 'trust' someone and let them take the lead... Not in a S&M 'spank' me kind of way... I dont know how to explain it... But yeah, her on top is my favorite! I love to watch a woman's body and especially her face as she is feeling pleasure... Gently caressing her body and feelings its warmth... It's like I can feel what she is feeling and it really turns me on!