Chromatic = Big Tone for Diatonic Players
A large embouchure is required to play the chromatic harmonica (playing a standard single note has your mouth over four holes... just like the diatonic... but those holes are larger. To play an octave your lips are over five holes... now that's a stretch!). Those that play the chromatic find it easier to achieve big tone on the diatonic harmonica, since they're already used to playing with a wide-open, resonant mouth cavity. For those of you wondering when's the right time to study the chromatic, if you like the sound, you can learn it now, at the same times as you do the diatonic, there are no conflicts with learning both at the same time.