“¿Even the new b…”

The Fairphone is faster - although perhaps not by a huge amount, has better battery life and a better camera. The official spare parts shop has parts for the Fairphone 3 onwards, earlier models’ parts are sold out. The Fairphone 2 was released in 2015 and has stopped receiving software updates this year, the 3 came out in 2019. 8 years of support and replacement parts seems to me to be much better than what Samsung or Google would offer you.

Specs differences: https://www.gsmarena.com/compare.php3?&idPhone1=12540&idPhone2=9536#diff-*,*,*

Chipset comparison: https://versus.com/en/qualcomm-qcm6490-vs-samsung-exynos-9820

Spare parts shop: https://shop.fairphone.com/shop/category/spare-parts-4?ref=header

I recently did much of the same research and ended up just buying a LitterBot 4. Not perfect and the cat begrudgingly uses it, but it does mean I don’t have to scoop the litter tray twice a day (or more) which is worth the outlay. The cheaper ones just seem to come with even more down sides.