The concept of car rental and Car-Sharing somewhat differs but share the fundamental of providing car access for a period of usage with the need to pay a monetary rate. Deciding on either option is dependent on your situational needs.
What do you need the car for?
How long do you need to use it?
Do you need to drive daily?
What kind of car type?
What’s your budget?
How is the operator’s reputation? Is it trustworthy?
What about customer service and support?