2013 MacBook Pro Retina 13" vs MacBook Air 13"
My first Mac is a MacBook Air.

It is now 18 months old -still a baby :)

I love it:

First it is slim and very light- important for me.

I do have the 256 Gig SSD, and after a Year it is filled up with Photos and Movies consuming 110 Gig.

I travel a lot and love the intelligent WiFi, it always finds me a connection.

The Display is sufficient for my uses, and the Thunderbolt is a killer.
I just connect my TV using a HDMI cable and have huge screen.

Speed is sufficient for what I do and it has not been bottle neck so far, and the 4 Gig RAM seem to do the work.

Since my laptops last about 3 Years, I do not mind not been able to do upgrades.

The Mavericks takes 5.3 Gig, so with all the Media stuff I recommend the 256 Gig SSD.

My MBA is tough (so far taken anything I trow at it), but have not drooped it to find out. The fans are very quiet.