I'd take a male without a second of hesitation. In 3 years, a female could already have ovarian / uterine cancer and she could have had a lot of phantom pregnancies already (my female did her first around at 6 months, before I got her spayed) which can cause mastitis and inflammations due to lactation. A single male can perfectly live without being neutered - we do it mostly for the owner's sake when the rabbit acts like a monster (it can happen with females too and it doesn't always happen especially if the rabbit is single) or when we want to bond them with another rabbit.
You don't mention the country you are currently living in but I would think long and hard before taking a rabbit if you are going back in the US in 3 years. I don't know a single plane company which accepts rabbits in the cabin which means a rabbit flying would have to do it in the hold (I'm not 100% sure it's the right word, but I'm sure you get what I mean). I take a 3 hours trip with my rabbits, by foot, car and train, when I go to my parents' place for the summer holiday and I'm already afraid they are going to get a heart attack from that (I had to give a gut stimulant and pain meds to my 4 year old bunny last week coming home from the trip, because he wouldn't eat and had a clear stomach ache due to the stress after the train ride). I really would hesitate to make them go anywhere by plane, in a noisy very hot place with cats / dogs, knowing that rabbits are very sensitive to stress, heatstrokes and heart attacks.
If the plane trip is short and that you can find a company which accept you taking rabbits in cabin, it's a possibility, but I think you should really try to look that up before thinking about adopting or you might end up having to abandon your bunny before leaving or getting a sick / dead rabbit when you arrive home.