I have cooked on an open fire in the past. It takes al ittle practice to get your particular mode of cooking down pat. but it can be quite effective and has a certain aesthetic and sense of accomplishment that you don't get on a stove.
Nevertheless, I usually use a stove, iso-butane these days.

Last year in September on the GDTMBR, there were a couple of young women on their first bicycle tour, using one of those twig burning wood stoves.
The weather was generally good, but there had been a couple of very rainy days, and it wasn't easy to find really dry wood. These two girls were reduced to burning their toilet paper to try to heat their water for their tea. They were suitably impressed by the power of fossil fuels when we offered to boil some water for them.