In general CPAP
For the average apnea
patient CPAP should be tried first before any other therapy.
However, I have had some patients with noses so obstructed and tonsils so large that I have operated on them first to clear their airway. In many of these selected patients their apnea was cured, in some they still needed cpap. A good airway exam is an important part of an apnea work up.