Windows 10 Pro should be recommended as it provides the ability to join a domain and manage local policies through the Group Policy Editor (gpedit.msc). Additionally, it includes BitLocker, which allows for the encryption of sensitive data. Windows 10 Home does not support domain joining or Group Policy and lacks BitLocker. Windows 10 Enterprise would also meet these needs but may offer more features than necessary and at a higher cost. Windows 10 Pro for Workstations is designed for high-performance tasks and supports advanced hardware configurations which may be beyond the scope of what a small business typically requires.