I'm going with hybrid:
- 2011 X-25E 64GB (2W write and almost nothing read/idle) at 100.000 writes per bit for OS
- 2021 PM897 3.7TB (2.3 Watt (read) ¦ 3 Watt (write) ¦ 1.4 Watt (idle) down from the PM983 (8.7 Watt (read) ¦ 10.6 Watt (write) ¦ 4 Watt (idle)) for DB.
This way I can get the most robust solution, with largest DB at lowest power. They are both in a 8-core Atom Mini-ITX board at 25W TDP.