I’m not sure any are better than others.
Also, are they ‘really’ sales-people – or just customer assistants?
You go to a dealership, as you’re interested in a particular brand – so a car is partly sold already : by the buyer.
If you don’t know what you want – you go to a Motability ‘day out’ event – then, from the relevant dealership : you buy, they don’t sell.
PS. Where’s Zayn??