TL;DR: There's no meaningful difference in protection between the three — the important thing is freezing all three bureaus, not just one, since a fraudster only needs one unfrozen bureau to succeed.
Equifax, Experian, and TransUnion are the three major U.S. credit bureaus, and freezing all three is one of the strongest free identity theft protections.
What to Look For
A credit freeze blocks lenders from accessing your credit report, which stops most attempts to open new credit in your name. All three bureaus let you freeze and temporarily lift your freeze online at no cost, but you must freeze each one separately since they don't share freeze requests with each other.
The Bottom Line
There's no meaningful difference in protection between the three — the important thing is freezing all three bureaus, not just one, since a fraudster only needs one unfrozen bureau to succeed.
If this looks similar to something else you've seen, it's worth reading Free Digital Footprint Checkers Compared.
This pattern shows up elsewhere too — see Free vs Paid Identity Theft Monitoring: What You Actually Get.
Frequently Asked Questions
What’s the short answer?
There's no meaningful difference in protection between the three — the important thing is freezing all three bureaus, not just one, since a fraudster only needs one unfrozen bureau to succeed.
What should I actually look for?
Equifax, Experian, and TransUnion are the three major U.S. credit bureaus, and freezing all three is one of the strongest free identity theft protections.