It depends on your business needs. With multiple packages available, you can select the right amount of capability for your team.
All of the editions come with the data model, mobile app, sales capabilities, store visit planning, store visit execution, and Einstein Vision for Consumer Goods Cloud.
Merchandiser is suitable for organizations that need their team to deliver in stores, digitizing operations to deliver optimized execution.
Field Sales has all of the capabilities of Merchandiser, plus it allows you to schedule visits powered by Salesforce Maps and capture orders on your mobile device
Strategic Sales has all the capabilities of Field Sales plus additional resources for onsite teams. It also includes advanced features of Salesforce Maps that let you plan and optimize selling motions.