I can get a Xiaomi with the same SoC, higher display ppi (unfortunately also bigger display, they're WAY too big IMO) and otherwise similar specs as the 6+ for 435€, but it's 300€ if I'm willing to drop to 8 GB RAM (still 7s gen 4 so in comparison to the base 6 it has a newer SoC).

Fairphone wants 600 for the 6, 650 for the 6+.

I'm going to want your source for the Fairphone because if it's significantly cheaper than the 435€ Xiaomi with 12 gigs of RAM for a 6+, I'd buy it despite not even needing a new phone yet.