The question is if you have haven't validated your product yet do you develop for iOS, Android or use a cross platform toolkit like PhoneGap. I think the answer

The question is if you have haven't validated your product yet do you develop for iOS, Android or use a cross platform toolkit like PhoneGap. I think the answer will depend on what you have experience with, who your target market is and whether you want to target tablets (which still leans towards iOS in my view). Validate on one platform and then expand to another if it works is my current approach but it definitely isn't the only one.