What's the best car hire company at this airport for reliability and good service
Car hire is usually a matter of preference and experience. Personally I have had good experiences using Avis and would use them again.
I have used both Eurocar and Avis and found them to be good.
Last few trips have been Avis and no complaints.
I have used Avis/Budget, Europcar and Hertz at OR Tambo and never had any issues.
My only complaint would be that the car park is quite dark, so take extra care when checking the car over.