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Depends on what you mean by 'best'--I wouldn't go to Marble Arch but do Sussex Gardens, Old Marylebone Road, and the A501, although I aim for further north. I'm sure I don't need to tell you what Oxford Street is like around 5:30. :) After that, it's the Hipster Spice Route, turning off Hackney Road at Goldsmith's Row and then right at the top of Broadway Market into Westgate Street.
You can obviously go parallel to either the A40 or the A501 and do the A5204 to Tottenham Court Road, but the best option after that is still to get back on the A40/A401 via Gower Street (southbound), then the A5201/A501 Old Street/A1208.
(Using all the numbers because I'm too lazy to type out all the changing street names.)
I'm still a 'maybe',
but best route from Marble Arch to Cook Daily?