I'd say yes, the security update is more important. But for Android devices that no longer get security updates, such as my 3a XL, supposedly, Play System update helps keep the phone less vulnerable to security issues. Or something like that.
https://www.howtogeek.com/686927/wha...hey-important/
"Google Play System Updates mainly address security issues, but they aren’t the same as the monthly security patches. Both are responsible for different things. All devices with Android 10 and higher can get a Google Play Security Update, regardless of whether they have the latest security patches."
"That’s the most important thing about Google Play System Updates: they don’t require firmware updates or phone manufacturers. This doesn’t mean Google can completely bypass your phone’s manufacturer and bring you the latest features right away. However, it does mean you won’t have to worry about some more critical security issues."
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