FB or Delta

--------------------------------------------------------------------------------


Great Site! Question is - have delta account for 2 family members 2 don't. flying bos-ncl on AF (cancelled flight bos-lhr so paying exorbinant price!) fl chart says 250% miles - delta says 150% so am I correct in assuming that we should use the 2 delta accounts and get 2 new FB to get more miles? we don't fly af a lot, but bos is a delta hub and we go to fla whenever we get enough points or uk if we have plenty. aren't the miles good for either airline so we should go with the program that gives the most points? I know, totally newbie question!