Well, this is a very difficult question. The heating values of woods will vary by species and region.
http://www.engineeringtoolbox.com/wood-combustion-heat-d_372.html will show the more common species of woods...well over a 100% difference between species. Let alone branches and twigs (the usual stove fuel), moisture content, etc... Way to many variables to say that it will consistently burn better than alcohol.
In most places, wood is an easy gather. Alcohol is guaranteed to work. Pouring rain storms, are not the best time for gathering wood. Alcohol is heavy to carry. They will both do the job. Some say to gather stuff as you hike. This doesn't save the carry weight for fuel for the day.
Personally, I don't care for the soot buildup. I spent many years, before I got a camp stove, cooking over an open fire. An alky stove has the aditional benefit of being cleaner. Not that this is a big deal....