It depends on the job.
We usually brush and roll smaller jobs; however, it is more cost effective to use an airless paint sprayer on larger jobs as it can quickly add an even coat of paint over a larger area.
Our painters are highly trained and know how to operate airless paint sprayers using the appropriate pressure and paint tip size to provide the proper coating to you project. This is important because it ensures even paint coverage and eliminates overspray (this refers to getting paint on unwanted areas).