Well, that comes down to a very specific question: Do you like iOS or Android better? If you are indifferent, what do you like/dislike about your current phone?

Well, that comes down to a very specific question: Do you like iOS or Android better? If you are indifferent, what do you like/dislike about your current phone? Also, if you're thinking about mobile development, go for the one you'll be developing on. You will have a much better understanding of what users want from their smartphone if you are a user yourself.