Who each tool is really for
Nutshell
Nutshell positions itself as a CRM for small business-to-business teams, with outbound email marketing brought inside the same product and a reputation built on accessible, human support. It suits teams of a few salespeople who also send campaigns to their own contact list and would rather not maintain a second database of the same people in a second tool.
Pipedrive
Pipedrive positions itself as a pipeline-first CRM that deliberately stops short of being a suite. The deal moving through defined stages is the organising idea, and the product is extended outward through a large marketplace rather than inward through extra modules. It suits teams that want the cleanest possible sales experience and already have opinions about the rest of their stack.