Since I'm a girl, and not a lesbian or [fake] bi I'd say the girl that wants me. Girls are hot and all, but I'm not all about trying to pick them up, but if I were single and a girl asked me to go on a date or mess around, I wouldn't say no.
But~~ if I was to tailor this question for me, reverse harem style (most reverse harems... are annoying and... magical girl...) I'd go with the one that I wanted. I've dated guys that wanted me and I didn't want, and that's... awkward, because it becomes a festering sore in the relationship that never heals. Usually though, if you want a relationship and aren't a creepy stalker, the other person has an interest in you, even a little.