Thanks for the great info!
I just signed up a family member with upcoming TPAC DL flight. I had brooded about choosing among SkyMiles, FlyingBlue and SkyPass then came across this thread in my search.
SkyMiles has devalued so much that I find it difficult for non-elites to redeem for low-tier reward travel. MileagePlan also has the added bonus of AA/BA/CX as a partner members in addition to major SkyTeam airlines!