Both businesses are vulnerable however it will be wise to invest in the logistic services. I really dont know how the car hire service id right now with the daily increase in I've and bolt ride. I think people do less of hiring cars nowLogistics/courier business is a very good business to venture into as you could grow into main logistics of cargo handling and trucking.But it needs thorough knowledge of operational schedule,staff that knows routes and good personel to client relationship.The issue of prompt delivery is also an issue.
But in a car hire service you would'nt encounter all these things.