Originally Posted by
PakThomas
... My question doesn't actually relate to which type of miles would be more useful to me, but whether, if I use my MP number rather than my KF number, thus crediting the miles earned to UA rather than SQ, ...
Regardless of who you post to, SQ will make the decision on what to post. If you brought an SQ fare, and there is a fare rule restriction, SQ may apply it in either case. However, without access the fare rules, it is not clear what Fare Conditions and "Not Allowed SIN-LAX" means.