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100% pro, the graphics card isn't amazing on the pro, but as you have said, if you are not doing any heavy lifting that you'd be able to get more out of your money in a long run.
Have you tried their refurbished nstore, sometimes there are bargains to be had. Or get someone who is a university student or work in Higher Ed, youd get 10% discount if they are there with you when you buy.
Or get them to log onto Unidays for you if you are buying online, which you'd have to if you are going for a custom specs.
What graphic cards do they have? And with the Pro, you is that the 13 or 15inch?
I have always found the weight and size difference is almost none between the air and the 13incbh pro.
So I'd go for the pro...