SMB plan ensures timely fixes for critical bugs in ERPNext. The Enterprise plan includes bug fix support as well as premium services like personalised onboarding, functional support, priority support, etc.
An SMB customer can generally be defined as a prospect with about 30 users or a revenue of around USD 1 Million/₹10 Crores. If any potential customer has revenues or users higher than this, they should ideally be offered Frappe Enterprise plans. Feel free to reach out to the Frappe Partners team to gain clarity before proposing to any prospective customer.