Flying to Norway on a W ticket this weekend. Oh... it is OS... and oh... I will credit to M&M to get 100% miles.
(Did I mention the expectation of hot food for free since it is more than 2 hours?)
My rule is as always; if Eco Flex or Business seek SK and EB. If ordinary Economy seek to fly LH/OS/LX and credit M&M. Choice is based on service and points (for W and below) and service (for "ordinary" tickets).
I still prefer SK over DY or NB. I generally have points enough so a flight or two in 25% does not matter that much.