Which one MBA 11" 64gb or White MB

My guess is that if you cannot find an answer to this question yourself, I wouldn't quite jump into the programmer/developer world.

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Both will suck massively If you don't get an external 1200p display.

Coding needs screen estate above all else.

More info needed:

Do you plan to write a significant proportion of your code on its internal screen, or will you just be doing a bit of editing/surfing on the go and mainly use an external monitor for your work?

Do NOT use an 11.6" screen for the bulk of any work. If this is a main computer and a main monitor, then get the white macbook.