Introduction
Choosing between PostgreSQL and MongoDB for your SaaS determines the technical future of your application. This decision directly impacts performance, infrastructure costs, and your ability to scale. According to the Stack Overflow 2025 survey, PostgreSQL remains developers' most loved database (67.8%), while MongoDB dominates the NoSQL sector with 24.6% adoption.
As a full-stack developer specialized in SaaS applications at Aetherio, I've implemented both solutions across more than 25 projects. This comparison will give you the keys to make the right choice based on your business and technical context. We'll analyze performance, scalability, costs and provide concrete recommendations based on field experience.
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