The verdict
If your site mostly explains what you do and sends leads to your CRM, pick Framer. If your business depends on a catalogue, orders and checkout, pick BigCommerce. Do not stretch either past its job.
For a small B2B team the question to ask is how many products you list and whether buyers order online. A handful of services and a contact form is a Framer job. A price list, repeat orders and an ERP link is a BigCommerce job. If you need both, treat them as two layers with separate owners, and check how they connect before you commit to either. A site that lives in Framer also cannot simply be exported later, so keep your content structured.