Defnitely use both.  I have found that for us, typically a larger size group of 6+ people on a 8-10 day trip, fire cooking is usually preferable for the cooked meals, as the fuel required for the large one-pot meals begins to be absurd.  In one fire-ban trip with 9 people for 10 days, we burned through 2 gallons using 2 MSR Dragonfly stoves, which are pretty efficient for the task.  Much of the fuel was used on the fish fry meals and baking, but it just takes a long time to boil water for that many people (just for meals and hot drinks, not for purifying drinking water).  Plus, you have the helping hands so firewood collection, fire building/maintaining, cooking and cleaning can all be separate tasks.  However, I still prefer to bake on a stove.

For smaller crews, the convenience of a stove often wins, especially if a fire is not desired.

I'm hoping that everyone knows to apply soap to the outside of pots prior to cooking over a fire.  Do it once at the start of a trip and it forms a good black coating.  At the end of the trip, you can wash off pretty easily.