need a side pic to be sure, but i would chose the first photo. In fact, i would want the light to sit about an inch or two lower so it close to centered between the top and bottom triple trees.
"I don't think it's nice you laughing. You see my mule don't like people laughing. He gets the crazy idea you're laughing at him. Now if you apologize like I know you're going to, I might convince him that you really didn't mean it..." http://youtu.be/KZ_7br_3y54
Do you really want your headlight to be the center of attention? That is what the bottom picture does for you. If I was passing by your bike on the road the headlight is all I would notice, and I would be thinking "how odd"! Your headlight, IMHO, should blend into the bike and follow its lines, not jump out and say "look at me". A suggestion might be to mount it on the lower tree with enough bracket to bring it somewhat center.
I've seen a few mounted up high like that lately. I thought about doing it my self but could figure out how to mount it. Yeah, it looks different, but who wants to be a sheeple? Isn't that what building choppers is all about? Far out ideas and things nobody else has done yet?