More information is needed. Do you have two Macs with Apple SSD's or did you try two Apple SSD's separately in the same computer? What model/year Mac do you have? If you're using non-Apple software to get the S.M.A.R.T. status of Apple PCIe SSD's, that may not be reliable. And I believe that the Disk Utility will show "Not supported" for the S.M.A.R.T. status if you have an Apple PCIe SSD. If you want to pursue this further, I think you should contact Apple (preferably visit the Genius Bar, if that's feasible). You can also try running diagnostics - I don't know how accurate that would be in assessing the SSD health.
As for the Seagate's, the S.M.A.R.T. raw data is likely to be accurate - as far as that goes (more on that later).
There was a post a few months back where the poster ran software which indicated their SATA SSD was failing. However, in looking at the limited raw numbers that the poster provided, rather than the interpretation of these numbers that the software provided, it didn't look bad. If that poster had numbers from when the drive was new, it would have been easier to determine if there was a problem with the SSD. So my opinion is that you can't accept the interpretation of a software program at face value - you need to look at the raw numbers.
The thing about S.M.A.R.T. is that it's not standardized or uniform across all HDD vendors (although there's only 2 big ones and a small one left). You can read the Wikipedia page for more information on that (it has footnotes to various information sources they used).
https://en.wikipedia.org/wiki/S.M.A.R.T.
I'm guessing your Seagate's are USB drives. If you have access to a Windows computer, you may want to try running SeaTools and see what it says (but check first if it's OK to use SeaTools on a HFS+ or Core Storage drive - I don't know).
For me, I use Scannerz software which does a surface scan to get an idea on the HDD health and look for whether or not IO errors are reported by the OS.
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