Carsharing is much more flexible than traditional car rental. You are not bound to any business hours, don't have to go to a station to pick-up and drop off a car if you actually need it for a one way trip within the city. So you gain a lot of flexibility and have all the advantages of traditional car rental: the providers give you proper insurance, provide a full tank or full batteries for electric vehicles and a good condition of the vehicles.
Carsharing is also a great possibility for short term and spontaneous trips, as you don't need to book your rental in advance, but you can just find a car close to you and drive off. The price for a short term rental is way more convenient than traditional car rental. If you need a car for a planned trip, there are also stationary providers, which allow you to book cars in advance. There are endless possibilities for your mobility needs.