Who each tool is really for
Vtiger
Vtiger positions itself as an all-in-one CRM covering sales, marketing and support in one product, and it carries an open-source heritage that still shapes how buyers think about it. It appeals to teams that want a single consolidated system rather than a family of applications, and to organisations with control or residency requirements that make deployment choice a real consideration rather than an academic one.
Zoho CRM
Zoho CRM positions itself as the sales product inside a very large cloud suite. The pitch is ecosystem: finance, support, marketing, analytics and more sharing one account and one vendor relationship. It appeals to businesses that expect to adopt several applications over time and would rather standardise on one supplier than integrate four.