Selecting a best SSL depends on your requirements. There are four types of SSL certificates as below:
Domain Validation SSL: This certificate displays that a domain is registered and that a site administrator is running the URL.
Organization Validation SSL: The Organization validation is mainly for the business websites that invite customers to purchase products online. This means the ecommerce websites.
Extended Validation SSL: It is the highest-class of SSL certificates that is used where transactions are being exchanged.
Wildcard SSL Certificate: It is for those that need their domain as well as sub-domains covered.
To select one from these you will need to spend some time to identify the best for your business needs.