MBA or MBP 13 or MBP 15 ?

Hi,
I'm considering a shift from PC to mac mostly due to the built and reliability of the hardware in apple.
I don't know much about it and wanted your opinion on what to choose. First, I need something that's easy to carry around so I guess 17inch is out of the way. I'm now left with MBA 11 or MBA 13 but then again, the 11 is a bit too small.
I'm now left with 3 main choices, MBA13, MBP13 or MBP15 ?
I'm mainly using my computer for work (lots of words, excel, outlook) but that's not so demanding. The main issue is that I work a lot with Photoshop, Illustrator and a web browser on and wanna make sure I wont be slowed down when I work. I know that anything will probably be better than my current PC (I can go for lunch and come back while illustrator is being processed) but still, I don't wanna be limited.
What would you recommend ? from your recommendation, what would you suggest as ideal config/upgrade?
I look forward to hear from y'all
thanks

The 13 inch models use Integrated Intel graphics.
The 15 inch models use that AND a discrete graphics chip, and switch back and forth as needed.
Once you said Photoshop and Illustrator, I think that kicks you into the 15 inch category. Also available with a Matte screen option, if that is important to you (the others are all glossy only).
The best thing to do is to go to an Apple store, and USE one. That is what the Apple Store is all about! Touch it!  use it! Make up your own mind based on the real machines. No one is on commission there.

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