OD&D monster saving throws

This is from the FAQ in the second issue of the Strategic Review:

Saving throws for monsters are the same as for the appropriate type and level of man, i.e. a balrog would gain the saving throw of either a 10th level fighter or a 12th level magic-user (the latter based upon the balrog's magic resistance), whichever score is the more favorable for the balrog.

I've always assumed monsters of a primarily magical nature save only on the magic-user table, but it looks like they should get to use whichever save is better in the circumstances.