Who each tool is really for
Keap
Keap positions itself around small businesses that want sales and marketing automation without an operations department. The recurring theme is the owner who is also the salesperson: capture the enquiry, follow up automatically, book the appointment, and stop the campaign when the customer converts. It suits local service businesses, coaches, clinics and small agencies where the follow-up itself is the growth lever.
HubSpot
HubSpot positions itself as a customer platform that grows with you, spanning marketing, sales and service with considerable depth on the marketing side. Its ecosystem is a genuine asset: a large marketplace, a wide partner network and an enormous amount of published training. It suits businesses expecting to build a proper growth function with someone accountable for running it.