Tuning - Harmonic Minor, Part 1

Let's look again at the standard tuning systems for the diatonic harmonica (C Major Diatonic Harmonica).

C E G C E G C E G C = BLOW
D G B D F A B D F A = DRAW

Here is the C Major Diatonic Scale: C D E F G A B C D

The Harmonic Minor tuning is designed to play in minor in 1st Position.

Here is the C Harmonic Minor Scale: C D Eb F G Ab B C

Here's the harmonica now...

C Eb G C Eb G C Eb G C = BLOW
D G B D F Ab B D F Ab = DRAW

Why would one choose to play in 1st Position (this Harmonic Minor tuning) over 2nd Position (the Natural Minor tuning we looked at before)?