Fully agree with DocMartin
We use wired work stations in each room, and I use an iPad for convenience in lot's of places. The latter is awful for data entry, even with a bluetooth key board it is not easy.
Use what fits your work flow, but I bet a notebook or wired desktop, + and tablet of some kind (Android tablets work just as well) of tablet.

Roger
(Nephrology)
Do the right thing. The rest doesn?t matter. Cold or warm. Tired or well-rested. Despised or honored. ? --Marcus Aurelius --