New branches of PHP have historically had issues that take a few releases to iron out. The 7.2 branch is no exception; I have a dev site running 7.2.1, and IMO it is only suitable for use by PHP code authors to test out its new features (and incompatibilities with previous branches).
My production sites used the 7.0 branch until 7.1.9 was released. I suspect I will not migrate production sites to the 7.2 branch until at least 7.2.10. You would be much better off updating to PHP 7.1.13 (the latest version in the 7.1 branch) than migrating to 7.2.1 (the latest version in the 7.2 branch).
The 7.x branches all have the same level of security; PHP fixes security-related issues in all current branches. The only major feature difference between the 7.1 and 7.2 branch is the sodium extension, but it is available for the 7.1 branch through PECL.
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This reply was modified 6 years, 9 months ago by Dion.