MBA 13" 2013 or MBPr 13" 2012

Hello everyone,

I never had Apple machine so I decided to buy the MacBook. However I do not know what I should buy. I want to decide between new MacBook Air 13" 2013 and the MacBook Pro with retina display 13" from 2012. Mainly I want it for coding, some photoshop work and in free time I will watch some films or play Dota 2.

What do you think is the best choice for me?

By the way: Sorry about my english.