The Whitewood mapping is the one that functions in the closest way to the familiar diatonic scale.
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Gorgo
Since the 7th harmonic is the lowest one that is accurately tuned, the gorgo mapping works well for creating consonant combinations of notes, and also has a wider range (nearly 7¼, with a slight upward slope). Bryan Deister demonstrates this mapping in 21edo groove (2026).
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Or this inverted version of the above, which is based on the 4L 5s scale:
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Augmented (August)
It is possible to use 21edo for some types of blues music, taking advantage of its highly accurate 7th harmonic, as demonstrated by Bryan Deister in 21edo improv (2026). The mapping for this uses a sharp septimal minor third ~7/6 as a generator with the octave divided in to three parts as a sharp classic major third ~5/4, making this an augmented temperament mapping of the flat fifth (august) variety, with scales 3L 3s proceeding right and down-right and 8L 1s (4/1-equivalent) proceeding right, with both scales having a 5:2 step ratio. (The ⅓-octave complement of ~7/6 is a mildly-flat septimal diatonic semitone ~15/14, which is one key down-right, a convenient mapping for a diatonic semitone.) The range is about 6¾ octaves, and the octaves slope down considerably (incurring vertical wraparounds mitigated by repeated notes), while the double octaves slope upwards mildly.
