These get compared like competing products, but they answer different questions for different buyers. Neither is objectively better — the right first move depends almost entirely on who's asking you for it.
The short version
- Mostly US customers, especially SaaS/enterprise buyers: SOC 2 is what they'll recognize and ask for by name.
- Selling internationally, or to EU/UK/APAC customers: ISO 27001 is the internationally recognized certification and tends to open more doors outside the US.
- Doing both eventually: very common, and the second one is meaningfully easier once the first exists — the underlying controls overlap heavily.
What's actually different
SOC 2 is an attestation report built on AICPA Trust Services Criteria — there's no pass/fail "certificate," just an auditor's opinion on your controls. ISO 27001 is a certification against an internationally recognized standard, with a real certificate a certification body issues. SOC 2 Type I can be achieved faster (often 60–90 days with good preparation); ISO 27001 typically takes longer as a first-time implementation.
Cost reality for a small company
SOC 2 is generally the cheaper first step for a US-focused startup, which is part of why it's become the default "first compliance project" for many SaaS companies. ISO 27001's certification audit itself is a separate, real cost on top of preparation — but if international sales matter to you at all, that cost buys you something SOC 2 doesn't: recognition outside the US.
The practical recommendation
Look at your actual pipeline, not a hypothetical one. If every deal blocked on compliance so far has been a US company, start with SOC 2. If you're already fielding "do you have ISO 27001" from a European or international prospect, that's your answer — start there instead.