Who each family is really for
Dynamics 365
Dynamics 365 is the Microsoft family of business applications, and its natural buyer is an organisation already standardised on Microsoft identity, email and productivity tools. The gravity of that ecosystem is a genuine advantage: shared sign-on, familiar interfaces, and a large partner network able to build around the platform. It usually assumes a degree of implementation effort and an internal or partner-supplied owner.
Zoho
Zoho is a broad family of business applications with a long history of serving small and mid-sized companies directly, often adopted without a partner. Its strength is breadth relative to effort: a small business can switch on several applications and administer them internally. As with any suite, the practical question is which applications you will genuinely deploy rather than how many exist.