Even if you buy a phone that isn't a pixel, then you just end up giving money to a different privacy-invasive corporation that will continue to partner with Google for search deals and surveillance advertising.

Pixels have wide aftermarket repair parts available, relatively reasonable pricing, and the largest support from custom roms since they all test on Pixels as a standard device. (same with app developers)

Pixels often have longer update periods than other brands, and many custom roms provide extended security updates on top of that.

Android development is guaranteed to continue supporting at least the Pixel phones over all others, it'll be easier to repair down the line, and the money Google makes from the sale is nothing compared to the money they'll lose by having less power to surveil you.

And as much as I like Fairphone, the specs just aren't worth the cost currently, although they are catching up as time goes on.

I personally use a Pixel with GrapheneOS, and it works better than any phone from Samsung I've owned in the past. (plus it's usually a bit easier to unlock the bootloader)

Just make sure that, no matter what phone you buy, you don't buy it through your carrier, as that will make your bootloader un-unlockable unless you pay off the full payment plan and have a carrier that supports unlocking the bootloader in the first place.