Databased Questions

You are implementing a NoSQL database to record the grievances of customers of an automobile company. You have freedom of recommending a Key-Value type database or a Document Database. Each of the grievance record is keyed on Customer ID, and contains certain other information like the Automobile model (examples: Camry, Civic, Corolla, Escort....), grievance category (Example: Mileage/Fuel consumption, Maintenance costs, pickup time...), and some description of the grievance. The system needs an ability to index and query the grievance records based on values for Automobile model and grievance category. As the Database Designer, would you recommend a Key-value type of database or a Document database? Please provide explanation(s) for your recommendation