Bigin fits teams with one or two straightforward sales processes and no need for deep automation. Zoho CRM fits teams with multiple processes, custom objects, complex permissions, or automation that has to reflect real business rules. The deciding question is not team size. It is how much process complexity your business actually has.
Bigin is usually right if:
Zoho CRM is usually right if:
Over-buying is common: teams choose CRM for the option value, then use a fraction of it and find nobody wants to maintain it. Under-buying is also common: teams choose Bigin on price, hit its limits within a year, and pay for a migration plus a rebuild.
Zoho does support moving from Bigin to CRM, and core records carry over. What does not carry over is the design work, because a Bigin configuration and a CRM data model are not the same shape. Choose for where your business will be in a year or two, not only for today.
If you cannot tell which side you fall on, that itself is useful information. It usually means the process is not yet defined clearly enough for either product to fix it, and that is worth an hour of conversation before a licensing decision.
Describe your sales process on a call and we will tell you which one fits, including if the answer is that you do not need either yet. Book a call.