Drug Store Brushes and Pro brushes, the difference

Is there really a difference between Pro brushes and drug store ones? People would rather use MAC brushes than drug store brushes but there is really no need. I use MAC brushes and urban decay brushes on my eyes and then i have some sephora brushes that still work well. The pro brushes are thicker and big up and apply better than drug store brushes so thats why people prefer them. With drug stores u probably have to spend more time and it will be more fruserating to get all the color u want too. especially if your using a light color. I think pro brushes are espevially better when u are using brushes for blush and powder foundation. thats why i use bare minerals brushes on my face. they are thick and work way better on getting it all rubbed into your face than drug store ones.