It's got to be on the tits for me. I grew up fascinated by tits, when I first started having girlfriends I was most interested in playing with their tits, so it was inevitable when I got into porn that cumming on tits would be my favourite. While I've really learned to appreciate asses over the last few years, tits are my favourite.
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The best money shot for me is the girl stroking the guy to climax, all over her tits. The face/mouth/tongue area is a distant second, then everything else I'm not bothered with. In my real sex life I always prefer to cum inside, and I've cum on a few asses, but for a visual in my porn it's north of the navel or I'm usually not interested.