off the topic but don't wanna open a new thread.

I am flying from FRA to PVG soon. It is Air China with booking class L.

I have three choices and need your advice.

M&M (no status) for 100% miles + 0% Bonus (about 100,000 miles)
or
DC (Gold) for 50% miles + 25% Bonus (about 75,000 miles)
or
OZ (Diamond) for 50% miles + 10% Bonus (about 60,000 miles)

I am not going to keep DC Gold any longer. My OZ Diamond will last till end of 2011.

So my only question is: MM or DC?

Many tks in advance.