Isn WP 9 For Linux (in the WP Office 2000suite) better than WP 8.1?
Few would agree. Its admirers seem to be, well, MS-Windows users, since WP 9 is pretty much the Win32 version recompiled in a Winelib environment, with RAM bloat, stability problems, and other glitches (including DOS drive letters in file dialogues!) that are routine on MS-Windows but not Linux. Very likely, WP 9 introduced some feature-set attractions, but needing to run emulation code with performance and stability problems seems a poor trade-off. I consider 8.1 vastly preferable.