Obviously you want your app to run on as many platforms as possible, for as little development cost as possible. A hybrid app (i.e. HTML5 + JS) facilitates that, but make sure before you get started that the app you want can be implemented well with a hybrid platform (such as Ionic). Some things to think about include:
- Sensors and other hardware (make sure the ones you want can be accessed from a hybrid framework)
- Visual effects (hybrid isn't great for graphics-intense applications)
- Libraries you'd want to use (some will work better with a hybrid framework)

If you want to discuss this issue more with respect to your specific app idea, let me know,

all the best,

Lee