The WDU comparison sheet is a blunt tool that may serve the purposes of the TV programme but falls way short of being of any practical use. Because it's generic in nature we found it didn't cater for the nuances of our personal situation. In fact, it was full of holes so is good for the show but fell way short of reality.
Suggest you follow the guidance of other comments in this thread and that whatever tool or spreadsheet you end up using you should be prepared to tailor it for your own incomings, outgoings and lifestyle remembering to take into account things like costs of public transport and/or, commuting costs, cars, fuel, utilities, eating out, insurance, entertainment, white goods and so on.