Its a hard choose unless you do actually put some thought into it. For raven she got the nice body, and the clothes REALLY show it. Some people may like her attitude as it can show that she maybe into bdsm or dom. She maybe the type where you gotta break to hear her moan like a naughty girl. Though it maybe a bit hard to tell if she wants to fuck or even go on a date since she's most of the emotionless
For starfire she got a nice body as well, though her clothes dont show it as much as raven. Her attitude shows that she will be into a lot of things, blowjob, anal, etc, you name it, just for the "earthling experience". She'll be easier to moan compare to raven and you may get some dirty (human) words from her too during it. She'll be eager to go again some other time and would love to go on dates since she's so affectionate.
Cause of this, my pick would be starfire
Nostalgae said:
I get off on the idea of Star bouncing in my lap with a wide smile, shouting something like, "Oh, I do love the Earth cock! My innermost splornot has quilaxed four times already! Will you not release your fluids inside me so that I may make the face that is O?"
i also agree on him with this