I agree with this answer. This is true! You find the one you love the most and you go from there searching for the best price through breeders. Start researching and good luck!
You will want both no matter which one you choose first. Trust me, I love both locales. Ambanjas make extreme color and Nosy bes can be true blue, whats not to love about both.
Like everyone else said just follow your heart. Nosy be's are awesome and they can display spme intense blue. Ambanjas, well they are amazing as well because they display so many diffrent colors. So wichever one you choose.