Secondary Leading-Tone Chords in Major and Minor

In minor keys, the vii°/V often uses the raised 7th scale degree, while in major keys it uses the diatonic 7th scale degree

In major keys, the vii°/x is always fully diminished, while in minor keys it’s half-diminished

The root of vii°/x in major keys is always chromatic, while in minor keys it’s always diatonic

The vii°/x in minor keys resolves to a major chord, while in major keys it resolves to a minor chord