For a portable development system, definitely go with the Pro. It accepts much more RAM, faster (and more powerful) CPUs, more disc space, better video hardware, and significantly better peripheral support. My wife, a professional developer and physicist at FermiLab, uses hers as a desktop replacement. Yes, it is bigger and heavier than the Air, and there may be times when travelling where you want a smaller, lighter system to take with you - my wife has a netbook that she uses for that, but if she is going on the road and needs all of her tools, then it is the Pro that goes into the backpack.
rubberman
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