The verdict
For most small teams reading this site, I'd pick Help Scout. You get the inbox and the help centre from one vendor, the inbox feels like email, and teams of five to fifty can set it up in a day. There is a free plan to start on. Pick Document360 when documentation is its own function, with several writers, approval steps and an internal wiki or API docs to maintain. Pricing differs. Help Scout is per user across Free, Standard, Plus and Pro plans, and its AI agent is billed per resolution. Document360 is quote-based.