Honestly, the keyboards on my 13" and 11" MBA seem just the same to me. Maybe the 11" is smaller or different in some way, but I never really noticed and the transition was instant for me. I am a fast touch typist, and I made just as many mistakes on the 13" as I do on the 11"
The physical size of the screen isn't much of an issue for me, but the dot pitch is definitely finer and that took some getting used to. In some software and on some websites, the small text is really tiny. I think my biggest issue was Apple Mail. It was just too small for me when I used the same settings as my 13" so I changed font sizes in the prefs and now it's fine. I use pinch/spread zooming more often in Safari too.
Really, you need to figure this out for yourself. I know it can be tough, but I have seen enough of these threads (and there are a LOT of them here) to know that there just isn't any consensus about which size is better. I guess that's why they make two different models.
The physical size of the screen isn't much of an issue for me, but the dot pitch is definitely finer and that took some getting used to. In some software and on some websites, the small text is really tiny. I think my biggest issue was Apple Mail. It was just too small for me when I used the same settings as my 13" so I changed font sizes in the prefs and now it's fine. I use pinch/spread zooming more often in Safari too.
Really, you need to figure this out for yourself. I know it can be tough, but I have seen enough of these threads (and there are a LOT of them here) to know that there just isn't any consensus about which size is better. I guess that's why they make two different models.