What is the best route from Liverpool Street or Tottenham Hale to Turnham
Green, with luggage?

We arrive on Friday 23 May in the evening and leave again Saturday 31 May,
early morning. When should we start from Turnham Green to be at Stansted
Airport at about 0730?

Looking at the tube map, I can at see at least these options:

Tottenham Hale - Victoria - Turnham Green
Liverpool Street - Holborn - Hammersmith (cross platform) - Turnham Green
Liverpool Street - Notting Hill Gate - Earl's Court - Turnham Green
Liverpool Street - Edgware Road - Earl's Court - Turnham Green
Liverpool Street - Tower Hill - Turnham Green

Is Stansted Express open return tickets + PAYG the cheapest fare?

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jhk