I have a similar question. I mostly fly SAS / * and secondly airBaltic but also AY and BA. The highest status I have ever achieved with AY is Silver / OW Ruby.
I am planning a DONE4 which may involve BA/LN/QF/CX/JL and AY. Which program should I credit my miles to?
My criteria is (in order of importance)
1. no fees/fuel surcharges on award trips preferably even on OW partner airlines
2. easy to achieve OW Emerald/Sapphire
3. awards with reasonable value
Hoping for an answer in this quite quiet forum!