What is the best Customer Relationship Management system for a business and why?

In my opinion Salesforce is the best CRM software in the market as of now. 

Why Salesforec CRM? 

Powerful, customizable, scalable 

Salesforce dominates the CRM market because it can be scaled and customized to meet the needs of a diverse range of businesses. The implementation timeline for Salesforce varies wildly due to different subscription levels and integrations that require varying levels of hands-on setup. However, once implemented, Salesforce offers one of the best user interfaces available.