what is the best laptop for running CS7 , macAir or MacPro

It is a bit of a subjective question, given the parameters laid out as you have.

Certainly a larger screen size will afford a better layout for seeing more of the media you are working on, but at the expense of portability.

From the point of viw about power suitability, the current Air is perfectly adept at nearly all facets of CS5, save for longer processing tuimes for complex filters, renderings and processing. Really, in order to gauge the relative effectivness of consideration of the Air, we'd need to know much more about your intended purpose and whether specific actions may require more CPU or memory. For my own prodfessional workt the 13" i7 Air works just fine for my Photoshop, InDesign, Bridge/Acrobat & Illustrator work. If I need a larger monitor for deskwork, I can dock my Air. I vastly value my Air over my previous work with a Pro model. However, I think my next purchase will probably be a Pro-Retina (13").

Decide how important portability is.

i Think one of the most important thing is the RAM. My Macbook air (i5,2012) has 8GB and works well with Photoshop. My iMac 21,5 (mid2010,i3) has now 12GB of RAM, and after upgrading from 4GB to 12GB i can feel a much better Performance especially 4 Photoshop CS5. So dont Save money @ RAM, especially for Rendering big Files 😉 ... RAM & SSD --> Perfect

i Love my MBA, but working on the 21,5 iMac is much better and makes more Fun... with the iMac you get the most MAC 4 your Money 😉 and you will never miss it... The MBA is perfect for Study... if you dont need a Notebook, just a Mac for for Professional Photo-Editing ,take the iMac or mini Cube (think you mean Mac mini) Bigger is better (SCREEN) especially for Photo Editing 😉

if you wanna save Money, go to Apple Store and buy a refurbished one 🙂 i buy my iPod Classic refurbished... it where like buying a new one 🙂