Macbook Pro 2012 or Macbook Air 2013

Question

Hello,
I looking to buy a Apple Laptop but really confused to which one to get Macbook Pro 2012 or Macbook Air 2012. Here are is what I do:
Web Development (PHP, Python Django, Node.js, Tornado)
Photoshop (4 times in 10 uses)
Illustrator (1 time in 10 uses)
Web surfing
Need a good backup time (min of 3hrs)
Want a good performance
Will have it for 4 years

Answer 1

Photoshop (4 times in 10 uses)
Illustrator (1 time in 10 uses)
When you use these, you'll be thankful you got a Pro.
Web development
Web surfing
Both are about equal.  Some game performance may be better on a Pro, especially if it uses the graphics chip.
Need a good backup time (min of 3hrs)
Don't you mean max?  A lot is dependent on how much data you have to backup and whether you choose to clone or use Time Machine.  Clones are faster the second go around.  Time Machine can be fast, but if you use it for archival, you'll be spending time turning off Time Machine, and archiving necessary to keep archives off the Time Machine drive.  And Time Machine needs at least twice the capacity of your original, where clones only need the original.
Want a good performance
Pro is invariably better performance than Air.
Will have it for 4 years
Both only get a warranty up to three years if purchased within the first year from date of computer purchase. 
http://www.safeware.com/ offers insurance, but not warranty.  
Some credit card companies extend manufacturer warranty.  Check if yours does.