EMF and WMF files have the advantage of being vector graphics that
can be scaled without loss of quality. This is not true for PNG and
TIF graphs. The difference in quality can be demonstrated by using
the commands below to create a set of four graphs. Import the graphs
into your word processor of choice, set the page format to landscape,
and rescale the graphs so that they fill the page. The EMF and WMF
graphs look clearly better
Although he may well be right about that ordering, both EMF and WMF are
proprietary, platform-specific formats that do not play well with
others. IMHO the .eps or ,pdf formats are far superior, since they are
also vector graphics formats that do not have the platform-specific
characteristics. One cannot create .pdf directly on some operating
systems, but an .eps can always be turned into a ,pdf if desired. All
of these hassles with Word's vagaries with embedded graphics can be
circumvented by using a professional typesetting solution such as LaTeX
(see the Stata Journal or just about any scientific textbook...)