With Mac OS 13 inch display was quite comfortable for me (MacBook Air 2011). After that I tried 15 inch ubuntu ThinkPad and it was a lot less comfortable even

With Mac OS 13 inch display was quite comfortable for me (MacBook Air 2011). After that I tried 15 inch ubuntu ThinkPad and it was a lot less comfortable even when I set up virtual workspaces and hot keys for switching between them. For me MacBook touchpad gestures for managing virtual desktops/workspaces is what makes the difference.