Based on a cost per day model, long-term car rental is much cheaper than daily rental. This is because you are committing to a minimum of one month, whereas with daily rental there is no minimum rental period to commit to and you can return the vehicle at any point. So, the effective daily rate is cheaper for long-term rental.
However, it’s more expensive per day than leasing. This is because with a leasing contract you are committing to between 12 and 48 months.
There’s a simple rule when it comes to acquiring vehicles on a rental or lease basis. The longer you commit, the less the effective daily rate of the car. But the lower the effective daily rate the less flexibility there is for you to return it.