A good missionary, with legs spread wide so we can see the action. Viewing missionary from behind is good too, since it gives a good view of pussy getting stretched out and tightly gripping the dick as it pumps in and out. But so does the cowgirl position...
I love girls with tight little asses, so it's doggy for me. Though my second favorite would be missionary with the girls knees pushed back towards her shoulders. Very nice view. Lots of eye contact.
For the climax, it's best to have the guy cum inside the woman, but if you want to show a cum shot he should at least be starting to squirt inside the pussy when he pulls out. Just like they used to do in the early days of porn. After 15 -30 minutes of fucking a hot, slick tight pussy, who wants to see the guy finishing himself off with his hand? How unnatural! There is no better way to finish off a good fuck scene than with a spurting dick injecting hot cum deep inside a hot, slick, tight pulsating pussy!
I just like to see something creative sometimes. Generally reverse cowgirl with the girls feet on the guys legs jumping up and down, but others do it for me too.
After doggy, my next favorite is titty-fucking. I prefer the girl on her knees for that. Although her on her back is also a pretty hot way to watch that...