The choice depends less on cost and more on how you plan to spend the week. Ask yourself one question: how many days will the car actually move? If the honest answer is “the arrival day, the departure day and maybe two excursions”, a rental car spends most of its life in the hotel car park while you pay for it. If the answer is “almost every day, because we are moving from Antalya to Kaş to Fethiye”, a hire car gives you freedom that no transfer can match.
Below we go through the practical points travellers tend to underestimate, so you can decide with open eyes. We run private transfers, so we have an obvious interest; that is exactly why we also say clearly when renting is the better option.