Which chord progression or tuning should I test first?

I’m launching Fretboard Lab today and I’d love practical feedback from guitarists, teachers, songwriters, or anyone who builds chord sheets.

The product is for a specific problem: a chord symbol alone is not enough. Cmaj7, Am7, Dm7b5, slash chords, and Roman numeral progressions can produce several technically correct shapes, but not all of them fit the hand, tuning, fret span, open strings, or the next chord.

For the first examples and screenshots, which would be more useful to see?

1. Standard tuning: ii–V–I and common jazz/pop voicings

2. Open/DADGAD-style alternate tuning examples

3. Songwriter progressions like I–V–vi–IV

4. Teacher-friendly printable chord diagrams

I’m especially interested in what would make the first 10 seconds of the page obvious: the ranked voicing list, the fretboard diagram, the progression workflow, or the export output.