What’s the best mobile device for hospitalists and emergency physicians to access EHR and/or PACS systems?

What in your opinion is the best mobile device for hospitalists and emergency physicians to access EHR and/or PACS systems from within a hospital environment?

Things concerning me are:

-battery life and hot-swap ability

-ability to be quickly and effectively steralized

-ease of use

-durability

-loss prevention

-processing power and speed of data transfer