Wider is “better” when the data in the document falls outside the gamut of the display and of course, you wish to view such colors.
Wider is “worse” when the data in the document doesn’t fall outside the gamut of the display because very subtle colors have a colorimetrically wider distance on a wide gamut device than a narrower gamut device.
IF you plot the gamut of the image (something you can do in ColorThink) on top of the gamut of the display, on top of the gamut of the output device, you see widely differing shapes and a mismatch in some areas of color space. Ultimately, there are colors you capture device, display and output device can’t all fully render.