The method to use depends on several factors. For example, the area, the texture or the ease of application.
Paint rolling may be more economical when it comes to big surfaces to be covered. It’s also the best option for meticulous work and small areas where a brush is required.
 
Spray painting, on the other hand, makes the job much faster, it can cover a larger area in a fraction of the time. It`s also the best option for uneven surfaces like popcorn ceilings or other textures.
 
The right method depends on the project to be developed and the factors mentioned before, although the application of both methods simultaneously is a common practice that leads to more efficient and satisfactory results in many cases.