Rationale (November, 2014):

CWG expressed a preference for the existing structure of this paragraph over the suggested rewrite. The change from “or, if not that,” to “otherwise” can be handled editorially, if desired.

The structure of 12.2.3 [over.match.viable] paragraph 3 is of the form

• X is better than Y if

• condition 1, or, if not that,

• condition 2, or, if not that,

• ...

It would be better to de-bullet this description, define the conditions, and then say, “X is better than Y if condition 1, condition 2, ...” This would also avoid the awkward “or, if not that,” phrasing.