smartmontools can be utter crap when it comes to interpreting SSD data. Some manufacturers seem to deliberately program the SSDs to report SMART data incorrectly, or report correct data under the wrong code[0], just to encourage you to use their proprietary software.
I have an 840 Pro in one server that works okay with smartctl, but the Corsair Neutron GTX in a different server has readings all over the board that are utterly useless.
On other operating systems any tool that can read the SMART data is what you should look for.