It does really boil down to which of the most potential locating devices are circulating in the area. So yes in South Africa (and many non-USA countries) there are more Samsung (and Huawei) devices.
That said, both tag types were effective in being located. Also, worth noting that these work without first having any 3rd party app needing to be intentionally installed in order to locate the lost tag. Having to first intentionally install an app is basically a 'lost' cause.
As an aside it is humorous to note in SA we worry about stolen items, not lost items ;-)
See
Apple AirTag vs Samsung SmartTag — The best smart tracker for finding stolen items in South Africa#
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southafricaWe tested the Apple AirTag and Galaxy SmartTag to see which would be easier to find if an item it was attached to was stolen. Here is what we found.