[Samsung Galaxy Note 9 Questions & Answers] 6thtry:
You can only compare values that are on the same sheet on that whole google spreadsheet-document, as there were changes in overall performance between the measurements sessions. And on the 2019/03-sheet, pay attention on the lower section where some test runs were made some weeks later, and started to show again the earlier lower rates. That is caused by something with the phone, not with the cards.

I did not retest all cards on the latter session (2019/03 ARL3). However, the latter session still gave enough info to conclude that the relative performances between cards did not change much - something that was slower before was also slower later. So the earlier results (2018/11) can also be used to judge the performance differences between cards (as long as one remembers to compare only between results from that same sheet).

Also, do read the details (individual test run results) on the lower parts of the sheets...

My earlier interpretation to avoid Samsungs was mainly based on the lowest capacity ones (64GB and 128GB) having large changes in performance between test runs, and that the 256GB model having bad random read rates and rates improvements on Tab S3 being less than expected and a hiccup on PC. Considering their prices back then, there were better cards for the same or even lower price, but of course depending which particular performance figure is most important for the user. The Samsung cards do still work, so if one can get them at relatively cheap price, they can be just fine.

Also note that the Samsung Evo Plus 512GB model is quite the different thing, even if it is branded into the same Evo Plus -series. It seemed to compete with Kingston Canvas React 512GB quite well, each card having their own weaker and stronger points.

About the bargains on Amazon... at least this

https://www.amazon.co.uk/Samsung-Mobile-UK-MicroSD-Adapter/dp/B06XFS5657/

Showing RRP £113.15 is bollocks. The card has been way cheaper for like half a year now (if not longer) - I bought it at 60€ in December. That 40'ish GBP drops it to 50ish €, so it might be now "worth the price" - depending how the prices of the other cards have changed.

IIRC, I also mentioned in earlier messages that the Sandisk 128GB Extreme / Pro / Plus variants seem to have pretty much the same results, whether they are Extreme, Extreme Plus, or Extreme Pro, yet the price jumps a lot for the Plus/Pro. So, I did not see a reason to buy those pricier variants and instead to go with plain Extreme, or even the Ultras, depending on the particular needs (read vs. write rates). And thus also I see no point in comparing price/performance of Samsung Evo Plus/Selects against Extreme Pro/Plus, as the latter have artificially high prices; compare against plain "Extreme".

The problem with the Sandisks is that it seems quite random which particular series are available at each capacity, at least after checking that the card being sold is really the latest generation. Note, both Samsung and Sandisk have produced different cards yet reused the series names, and Samsung even messing "+" vs. "Plus", and many sellers do not realize this, and happily sell incorrectly identified cards... This is why I have listed the exact product codes for the cards I tested. Which in turn is sometimes messed up by Amazon having some own Amazon-specific codes, and I have listed those cases, too.