Car Rental. El Calafate to Torres del Paine.

Has anyone rented a car for this trip? We are three persons
I would like to go to Torres del Paine from El Calafate. After much research I have found the following
options.

1. Take a bus from El Calafate to Puerto Natales. Spend the night and take another bus the next morning to Torres del Paine.
Con: Too much time
Pro: Most economical

2. Private transportation: Private driver is $490 each way
Interhabit.com is $103 per person
Always Glacier is AR 310 (about $75) there and $45 back (different days)
Con: Expensive. For 3 it is $360. Tour starts at 5:30 am
Pro: No getting lost. Can get there in one day.

3. Rent a car. A Volkswagen 5 door car can be rented for 7 days for AR 1,680 (about $400). Plus gas
Pro: Freedom but chance of getting lost.
Con: Where to park . Hassle of driving.

Since the cost is not that different I am wondering if there are advantages to car rental. Or disadvantages.
Does anyone know? Are there great places to stop if you have your own transport?
Is parking a problem?
The car co. indicates crossing the border with the car is fine.
Will border crossing go faster with a car?
I would appreciate any experiences anyone has.

Thanks