Mobile app UI: Native SDK vs. HTML5

Question

iPhone

Suppose you are faced with the task of writing a cross-platform application for iPhone, Android and other modern mobile OS; for example, a mobile client for your web service.

What will you choose: learn the intricacies of the native SDK to build UI for each specific platform, or use WebKit and HTML5?

I note right away that the use of HTML5 in no way restricts access to all the functionality of the device, since the WebKit engine on both iPhone and Android allows native code and javascript to interact. The question concerns only the development of the user interface - layouts, widgets, animations, various graphic elements, and the like.

Answer 1

definitely native sdk - web applications on android are quite clumsy after all (the same google reader, for example)

Answer 2

I will definitely choose HTML5, since now there are already many frameworks that allow you to write quickly, efficiently and efficiently.