In The Gambia they are working on an EMIS implementation using Chromebooks. The DHIS 2 Android application is working well although there are some things you might consider while planning:
- Chromebooks have limitations on terms of OS and are not fully capable computers. For example some software might not work (current Microsoft Office package depending on what you have). Also in terms of processor are usually a bit limited.
- You will probably need to include a management layer to manage both the devices and the users. This usually comes with a Google subscription, education centers, NGOs and developing countries can benefit from a big discount. This point could be avoided by setting every Chrome as a standalone device but I would really not recommend it as it will be a big headache to support in the future. If, however, is a short project (in time) could be an option. This would also apply most probably for any Android implementation but with the Chromebooks you cannot use the device without a Google Account (that is the difference between the phones and the Chromebooks)
- Some Chromebooks do not have touch screen, this might impact on your training and your manuals. You might need to budget external devices (i.e. mice) as data encoders might not feel comfortable with the touchpad / trackpad.
So, in brief, DHIS 2 Android App works well and the questions above are questions that you might consider for any implication (either phones/Chromebooks). If you have specific concerns I might be able to help you a bit better.
Maybe someone from The Gambia can give a better input on how they have done all this. Also @jerry might be able to contribute to this discussion.