"What kind of device is best?"
It depends if you cough easily or not. A joint is the most efficient way to smoke but it is a little heavy on the throat. A bowl or bong is more costly and not as efficient but easier on the throat.
This is a very individual decision. As a patient, I’m interested in my overall health, so I prefer vaporization. For me, I really enjoy a small vaporizer called the "Magic Flight Launch Box." It uses a rechargeable battery for the heat source and is useable even in the pouring rain, outdoors. If you are new or returning to cannabis I think you’ll find the gentle and very controllable intake a pleasant way to ingest the medicine with very little coughing and without ingesting anything other than the heated, active ingredients.