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Comparison

MongoDB vs PostgreSQL

MongoDB lands on Depends, and PostgreSQL lands on Worth it.

PostgreSQL

postgresql.org

Worth it
Confidence: High

Buy if your team can write SQL and own database operations . it is free, powerful, and proven at massive scale.

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MongoDB versus PostgreSQL
CompareMongoDBPostgreSQL
VerdictDependsWorth it
Best forDocument-heavy, fast-changing schemasEngineering teams with SQL skills
Who it's not forRelational, join-heavy data . reviewers say Postgres winsNon-technical teams that just need a shared spreadsheet
PrivacyActive threat surface: critical 2025 memory-disclosure CVE reportedly exploited in the wild, plus a 2023 customer-data incident; patches released.⁷Mature and actively patched . but 2025-2026 brought real CVEs, including one exploited in the wild.16
Support qualityTrustpilot cites 'big company with 0 support'Guess: community support; paid via EDB, Percona
Public sentimentUsers love the flexibility and quick start for document data, but commonly gripe about support, scaling costs, and default to Postgres for relational work.Developers consistently praise Postgres as robust, fast, and the default relational choice; the friction is operations, not the engine.12
Biggest gotchaMongoBleed (CVE-2025-14847): exposed or misconfigured instances were targeted; patch fast and audit exposure.CVE-2025-1094 saw real-world exploitation; patching discipline is mandatory.

Pick MongoDB when

  • Document-heavy, fast-changing schemas
  • High-write, non-relational workloads
  • Developer-led product teams
  • AI app data layers

When MongoDB is not a fit

  • Relational, join-heavy data . reviewers say Postgres wins
  • Average CRUD apps . Reddit discourages it
  • Non-technical teams wanting a simple data list
  • Anyone without a developer on staff

Pick PostgreSQL when

  • Engineering teams with SQL skills
  • High-growth apps needing serious scale
  • Companies fleeing Oracle license costs
  • Cost-conscious startups

When PostgreSQL is not a fit

  • Non-technical teams that just need a shared spreadsheet
  • Solo users tracking contacts or small lists
  • Companies with no DBA and no managed-hosting budget
  • Buyers expecting vendor SLA support out of the box

Sources

  1. MongoDB Reviews | G2g2.com
    review
  2. MongoDB Reviews | Trustpilottrustpilot.com
    review
  3. MongoDB Reviews | Gartner Peer Insightsgartner.com
    review
  4. MongoDB Reviews | Capterracapterra.com
    review
  5. Is Choosing mongodb a bad decision? | Reddit r/nodereddit.com
    review
  6. MongoDB Pricing | MongoDBmongodb.com
    official
  7. MongoBleed: Critical MongoDB Vulnerability CVE-2025-14847 | Wizwiz.io
    security
  8. Threat Brief: MongoDB Vulnerability (CVE-2025-14847) | Unit 42unit42.paloaltonetworks.com
    security
  9. Alerts | MongoDBmongodb.com
    security
  10. MongoDB investigating security incident | TechCrunchtechcrunch.com
    news
  11. MongoDB commands 6.88% market share | Enlyftenlyft.com
    news
  12. PostgreSQL Reviews 2026: Details, Pricing, & Features . G2g2.com
    review
  13. PostgreSQL Products | Read 682 Reviews on G2g2.com
    review
  14. Just use Postgres . r/programmingreddit.com
    review
  15. PostgreSQL Reviews, Pros and Cons . Software Advicesoftwareadvice.com
    review
  16. CVE-2025-1094: PostgreSQL psql SQL injection (FIXED) . Rapid7rapid7.com
    security