I'd love for you guys to weigh on whether to put more work on OW especially JAL..

(1) What is most important to you in a FFP?
Baggage allowance, Upgrades and lounge access. Cheap-ish business class tickets would also nice.
(2) How many miles do you usually fly each year & in what class? How many flights/sectors?
I fly at least 1-2 times a month within the EU, but 3-4 trips to Asia and Latin America, typically in economy though I've spent 2-3 business class tickets as they are around 1100EUR.
(3) What types of fares do you usually buy?
Usually economy fares. Very rarely business, at least with cash.
(4) Can you choose your airlines and/or class of service? Do you travel for work and/or pleasure?
I often fly with BA, IB and JAL for OW. I have a FB Gold so KLM/AF is often default. Travel for work but some leisure if needed for miles/TPs
(5) Which routes and airlines do you fly most often?
AMS/FRA/CDG/ARN for repositioning, typically to MNL, BKK, NRT, GRU. Would love to be able to get good flights to LA. Within EU, I fly to MAD, BCN, BER, ATH/
(6) What is your home airport?
AMS but can reposition to Germany or France,
(7) Do you have FFP status of any kind in OW or other airline? What is it? Do you have any miles banked in a FFP?
Getting FB Platinum this year. However, NRT and other Asian flights are often better with JAL.
(8) Preferred Airlines? Most common Airlines flown on?
JAL, KLM/AF, mostly European airlines due to location.