I can tell you from my experience coaching both Boys and Girls HS level hoops that coaching girls is a must for developing your own skills as a coach. I coached in a great boys program, and once I moved out here I started up in AAU with U16 teams in West. Mass. Once I came out east I decided to take a job at the school I work at coaching freshmen girls.
First off, the talent level drop off is frustrating, so just accept that, and move on. On the positive side though, it allowed me to breakdown my own drills and skill development to a lower level, which was great because it caused me to focus much more on the finer points of instruction. One of the great things about coaching girls, is that they can be extremely coachable and listen to direction intently, which calls for you as a coach to really develop your communication skills (for ex. being specific about your expectations regarding a drill and clearly outlining the point and technique). It also allows you to critique yourself, as applying your coaching skills to a different population can only help you get a better understanding of the info you are trying to relay, and the method by which you are relaying it. Lastly, we all know that the fundamental aspect of good girls basketball is the key to success, as talent that can dominate games is alot less abundant. So coaching players with a limited skill set calls for you as a coach to focus on other keys to winning, such as efficiency, ball control, and number of possessions. Your team will live and die by your play calling and your team's discipline, which are direct reflections of you as a coach.
ultimately, I hope I didnt state too much, but I found myself in a similar situation and I think that coaching girls greatly improved me as a coach. ALso, in terms of the future, ADs love to see someone who can apply their trade to everybody, as it speaks volumes about who you are as a coach and a person. Good luck with your choice.