Sandisk only makes one card and I think it's a good option since it was developed in conjunction with Canon's CFExpress cameras, but the first version released had a problem in Nikon cameras. The premium cards are Sony Tough, Delkin Black and Delkin Power, and ProGrade Cobalt.
In my testing the write speed once the buffer was filled was about 50% slower using an economy card. Stick with the premium CFExpress cards because the other cards are slower - sometimes significantly slower. I have not seen results of test speeds for the Delkin Black, but the reported write speed is faster and that should mean improved thermal throttling. There is a new high performance Delkin card called the Delkin Black - and it's a little faster than the Delkin Power. The economy line - the Delkin Prime - is an economy card and is significantly slower. The Delkin Power CFExpress card is a high performance card and is one of the best in terms of lowest cost per GB and best speed (based on testing).
Your original comment indicates you are buying a Delkin 128GB CFExpress card - but Delkin sells three different card lines. I bought a Samsung Note 9 the first time I used it, and I was afraid it could be a clone, but heck the device is original Samsung and regularly gets updates from Samsung the Samsung does recognize the serial number. The only drawback is that shipping takes ages, almost a month or even more to arrive, but it does eventually arrive. I have no idea how could they sell products and ship to Europe with such competitive prices, they beat any local retail or even Amazon with the prices. The website where I bought it from is called EGlobalCentral and they have a dedicated website for different countries. I am still waiting for the card to arrive. I ordered a 128 GB Sony TOUGH CFexpress Memory Card Type B from a Chinese manufacturer directly (all is made in China! And this is NOT a clone or fake card!), so I saved around 60 euros of money, I payed 189 euros for that as of May 2021. I personally found this article very helpful
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