(1) What is your home airport?
Brussels (BRU)
(2) How many miles do you usually fly each year & in what class?
in the past 25K in Y and 20K in C, in the near future probably more
(3) What types of fares do you usually buy ?
Discounted Y and discounted C.
(4) Can you choose your airlines and/or, class of service?. Do you travel for work and/or pleasure?
Can mostly choose airline but not class (see explanation below). Travel 90% for work.
(5) Which routes do you fly most often
Intra-Europe, Intercontinental (North and South America, Asia)
(6) Do you have FFP status of any kind of OW or other airline at present? What is it?
Miles&More FTL (*A Silver)
(7) What is most important to you in a FFP?
Lounge access, upgrade, redemptions
(8) Preferred Airlines
Prefer *A, hope to make it SEN this year.

As I cannot always justify choosing a much more expensive flight on *A, I will need to make some intercontinental trips on OneWorld.
Thanks for your suggestions..