I am a long time Wacom tablet user. a small one: 6x9 or so.
I use an accessory Wacom mouse on the tablet to work in Archicad and most other programs. It has no battery and is very lightweight. I use the stylus as an airbrush in art programs.
You will be frustrated trying to use a stylus on a tablet because there is no rest for your wrist, you must be absolutely accurate all the time - a mouse is forgiving because it is so stable. You can leave it behind while you keyboard with both hands. The stylus must be re-established whenever you pause. This slows work progress.
As for the "carpool tunnel" issue, variety is the key: elevating the tablet to different heights is the trick. The front edge of the tablet provides arm support - I work 14 hours a day with this arrangement and have no physical problems. I have the speed on the mouse very high, so mere finger twitches can accelerate it across the display - the control software is very good.
So: tablet, YES, Stylus: NO.
Dwight Atkinson