Appreciate that the OP asked for info from care sales people and only one has responded (in among all the opinion), but I’ll wade in anyway:
The macro decision should be “buy or lease”. If you decide to lease, then it’s a simple rental payment.
If you buy – whether with your own cash, cash borrowed from a bank or dealer finance – then all you ever do is cover the cost of the depreciation between the purchase price and your eventual sale price.
The secret is to find the method you’re happiest with to cover that cost.
Assuming that buying cars is some dark art with sales people ready at every turn to trip up the unwary is massively over thinking it.
After all, cars – except in very few circumstances – are just white goods like your fridge or washing machine. Do we really agonise over those in the same way?