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KZ ZST (2016) vs KZ ZS3
The KZ ZST (2016) makes for a good, if unremarkable, Earphone for people with a $30 budget.
The KZ ZS3, however, is merely mediocre at its $13 asking price, when compared to similarly priced products, and won't satisfy the needs of most people.
In either case, we suggest that you first take a look at some other options at the $30 and $10 price points before committing to one of these - it's likely that you'll be able to find some better alternatives.
If you're still interested in learning more about the KZ ZST (2016) and KZ ZS3, however, we wrote a summary of what we could find about them:
The KZ ZST (2016) was loved by reviewers at Rtings, a highly trusted source that performs reliable in-depth testing. It did great in its "The 5 Best Cheap Earphones - Summer 2020" roundup where it was named its "Runner Up for Best Cheap Earbuds - Wired Alternative", which, in itself, makes it a product worth considering.
As for the KZ ZS3 - Head-fi, a source that conducts reliable hands-on testing, has featured it in its KZ-ZS3 Hifi High-End 3.5mm In-Ear Earphone Headphones Earpiece Original Headset Bass Earbuds With Microphone review roundup. However, it didn't make it to any of the top spots.
We conducted an analysis of all of the review data that we could find on these two products. First, we focused on sources that tested and rated both of them, like Head-fi, and learned that they all showed a preference for the KZ ZS3.
Then we took a look at the highest review scores that these two Earphones received. We found that the KZ ZST (2016) managed to earn a rating of 8.3 from Head-fi, whereas the KZ ZS3 got its highest, 9, score from reviewers at Head-fi.
Lastly, in order to better compare them to the rest of their competition, we averaged out their review scores. The KZ ZS3 managed to get 9.0 out of 10 - considerably better than the 7.3 review average of Earphones in general - whereas the KZ ZST (2016) earned 6.9 points.
It should be said that doing a direct KZ ZST (2016) vs. KZ ZS3 comparison might not be entirely fair due to the difference in their prices - some sources don't put much weight on value for money and thus tend to give better review scores to more expensive products.