Not every iPhone application requires a corresponding AppleWatch application, even if the market operator which is a nice gimmick. For example, we do not need to read on your watch, because no one has this strange demand.
With increasing application icon, watch dial can become very crowded, because there is no folder for storing them.
We’ve seen some great watches applications, such as Mint (EBA), it is only used to display the current budgetary situation. Remote application has only one function: to control AppleTV. MLBAtBat only provides a quick tour of your favorite team live scoring function.
All in all, your iOS application is the core, and should AppleWatch as its subsidiary. So, you’d better to design iOS apps, if in the process, you find a nice watch application usage scenario, and then you went on to do it watch applications.