[borrowed from: http://www.cv.nrao.edu/~pmurphy/doc-interchange.shtml]
People who use both Word and WordPerfect will usually let you know in no uncertain terms that the big problem with the former is its lack of the "Reveal Codes" functionality. This means you cannot really see the structure of your document, and some of the hidden codes may make it unreadable in other word processing or translation programs. This functionality is made possible in WordPerfect because the foundation of their file format is solidly grounded in SGML (Standard Generalized Markup Language, the parent of HTML).
I'm biased. I have believed for years that WordPerfect (WP) is a superior product to Word. Many of my colleagues who have used both concur. As alluded to above, Wordperfect has two good features going for it:
This word processor has some added advantages. Its ability to render complex formulae, while still second fiddle to the wonderful (and free) TeX and LaTeX markup languages, has still made it a favourite of many Scientists. And it does possess some crude typesetting features, such as the ability to manually insert ligatures (e.g., for ff, fi, fl, ffi, and ffl) and do hand-crafted kerning (minute adjustment of the "leading" [as in lead weights printers used to use] space between characters). And finally, it is not restricted to the Windows platform, and has been available for Linux since before 1997.
Alas, the temporary (and rather costly) purchase of a minority
stake in Corel by Microsoft in the early 2000's had the unfortunate side
effect of curtailing the availability of WordPerfect for Linux. Corel
dumped its Linux OS business, and let the Linux version of WordPerfect
die a sad death shortly afterwards. So while you can still find old
versions of WP Office 2000 for Linux, getting these to work on modern
Linux distributions is problematic (Corel used their own tweaked version
of Wine (the WINdows Emulator for Linux), one that is incompatible with
modern versions, including the Crossover version
[http://www.codeweavers.com/]. One can hope, now that Corel is no
longer under the thumb of Microsoft, that they may yet resurrect this
useful package for Linux users, but other than a brief "test" re-release
of WP version 8 for Linux (one that has stability problems in modern
environments, in my experience) they have shown no interest thus far in
doing so. At this point, despite the compelling "Reveal Codes"
function, I've given up on Corel and now use OpenOffice instead.