Company Customer Database Setup

I need a well-structured database focused on storing customer details for my company. I have not locked myself into any single platform, so I’m open to either a traditional SQL solution (MySQL, PostgreSQL, SQL Server) or a NoSQL option (MongoDB, Firestore) if you can explain why it’s the better fit... (Budget: $15 - $25 USD, Jobs: Data Management, Database Administration, Database Design, MySQL, NoSQL, PHP, PostgreSQL, SQL)