It can be cheaper to rent a car in the city rather than at the airport. Airport rental car facilities often charge additional fees, such as airport concession fees and customer facility charges, which can add significantly to the overall cost of the rental. Also, the competition at the airports is usually less than in the city, thus the prices tend to be higher.
Additionally, you can often find better deals by renting from an off-airport location, using discount codes or coupons or by renting from a smaller, independent rental car company.
However, it's important to keep in mind that renting a car in the city may require additional transportation costs to get to the rental location, so you should factor this into your budget.
It's always best to compare prices and fees from different rental car companies and locations before making a reservation. This way, you'll be able to find the best deal that suits your budget and your travel plans.