Male, without a doubt.
Male celebrities that I would like to meet often have something of value to offer me in a personal interaction. While I am certain that there are plenty of female celebrities that would offer a similar value, I have not found one to be a "fan" of. This may simply be the result of unintentional sexism, but regardless of the explanation, I am simply unable to come up with the name of a female celbrity that seems as though she would offer something of value in a personal interaction. The only one that really comes to mind (Ayn Rand) happends to be deceased.
As such, most female celebrities that I like tend to be actresses, who are, at the end of the day, simply people gifted in the art of lying. While I suspect there is some value to be had in such an interaction, any meeting I have ever had with such a celebrity (male or female) has been entirely underwhelming. Since it would be fantastically improbable that anything physical would occur (or any relationship would begin if you prefer), the argument in favor of the female is rather lacking.