If you don't think you could pull that off without it being awkward, I feel like I'm not the best person to offer an opinion, since I'm probably not in your target audience. But if I was the person in charge of the decision I'd choose female. This isn't a knock against females, but there's something about a female talking deeply about something incredibly technical that I think a lot of guys will find really sexy and compelling.

However, I really think that the most serious metric you should be considering is charisma in general. Can this person project that they really care about what they're saying? You're gonna get better response to an excited-sounding male than a terrible female actor, and vice-versa.