I prefer the pro over the air, because for me, the weight gives it added stability. The air could fly out of my hands because it was so thin & light. I think if you're not moving it around much, that wouldn't matter, but I drag my laptop all over the place & am more careful with the pro than the air.
__________________  [I] Dani: Happily owned by Billi-Jane & Witten 
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