I like Samsung hardware a LOT, they are usually pretty cutting edge. I'm decidedly less a fan of their software. They run a custom launcher which is very meh.
Contrasted with Google, their hardware leaves a lot to be desired especially at the flagship price. The software (stock Android) is solid though. You are also guaranteed updates, I believe now the Pixel 8 is for 7 years. I don't know of any other Android devices that will get updates for that long.
Google support is also pretty lackluster. I haven't had to deal with Samsung so cannot comment there. I hear it's better.
they lied
Quallcomm will discountinue support for the socs used five years before fairphone says updates will finish
they also use public keys for verified boot, meaning that verified boot basically does nothing
control+f and search for fairphone in this page for more info: (https://www.privacyguides.org/en/os/android-overview/)
Your link mentions Fairphone 3 and 4. They had regular mobile chips by Qualcomm that are not LTS. But Fairphone 5 comes with a Qualcomm QCM6490, which is not mentioned in the page you linked.
Flagship price? You get a Pixel 8 pro and a pixel watch 2 for $900. If you sell the smartwatch for $300 (MSRP is $400) you come out at $600. The S23 Ultra and iPhone 15 Pro is at $1300.