I consider that the screen size depends on the use we will give to the laptop, in the case of the laptop if it is only reading or consultation 15 inches is fine however for design work or other professional environment always large screens say 17 inches is quite feasible, imagine having open the photo viewer, Adobe Photoshop, and the image database window to use. not only that but also, the resolution, because you can have 15 inches but the resolution can be high and be feasible too, but 17 inches with 1080 x 720 ppi or 1920 x 1080 ppi. is great.