For me anything bigger that 13" is anchored to the desktop and I don't consider it mobile. 11"-13" is mobile for me or 20+" for desktop. In between are useless

For me anything bigger that 13" is anchored to the desktop and I don't consider it mobile. 11"-13" is mobile for me or 20+" for desktop. In between are useless screen sizes for me because I'm not going to lug around a 15" or 17" laptop and if it's going to be on my desk, I'm going bigger.