Have never had a Mac before, but am getting tired of my PC and Microsoft. Considering a MacBookAir because of the cost. Debating on 11 or 13 inch screen. I understand that these are not the retina screens, but upon reading a few posts tonight am beginning to think there may be a difference in perceived clarity between these two sizes. Am I wrong? Could someone be so kind as to explain this to me? I guess I could go look at the time side-by-side, but would feel more comfortable if someone could explain what differences I may see first. Thanks!