The term "pro" is relative, and anyone who knows their way well with air and airless sprayers can use either based on their needs and the size of the project at hand. An airless sprayer will suffice for a larger project, while an air sprayer is better for smaller projects. However, most professionals with years of painting experience prefer using airless sprayers. As a beginner, you would be better off using an air sprayer because it is more forgiving.