Think it would be accurate to say that both adjust for it good enough that if they do have any more than minor issues with read speeds dropping it is not really evident in the tests I've run.
Read speeds have some individual variance but there are few drops that are even approaching something major.
Now on to whether they maintain those read speeds through rewrites.
The Trion 100 has no SMART-value for amount written to it except for percentages of write cycles used which means that any amount of rewrites will be concealed.
The pattern it has when it comes to read speeds I think suggests that it does not rely very much on rewrites however.
The Trion 150 does have a SMART-value for amount written to it however and I've seen that it has gone up between tests.
However without knowing what those increases mean in terms of amount of data written it is uncertain whether it is doing rewrites or possibly just performing some GC.
I'd say that unless they have a strong aversion to certain temperatures (or a strong affinity to those temperatures they've experienced in my tests) any read speed degradation should not be noticed when the drive is powered on and would still be pretty well controlled after it has been powered down (depending on time, wear and temperature of course).
Which is why I intend to test drives with a folder of files written to it at low temperatures to reduce the possibility that they do well because they like heat (when writing).
How to do this seems difficult however since they heat up fairly quickly and then there is also the question of getting a credible temperature (especially difficult for those that lack a working temp sensor).