The Apple Watch Series 6 and Apple Watch SE smartwatches sit alongside the older Apple Watch Series 3. The Series 5, Series 4, Series 2, Series 1 and the original Apple Watch are all discontinued through Apple.

To make matters simple, we’ve compared the Apple Watch Series 6 to the Watch SE and Watch Series 3 here so you can see exactly what the differences and similarities are, whether you’re looking to upgrade or take the smartwatch plunge.
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https://www.pocket-lint.com/smartwatches/buyers-guides/apple/138782-apple-watch-series-3-vs-apple-watch-series-5-whats-the-difference