Recently, I was playing my cement-gray Horner 26, the sister to the claret (red-wine-colored) Horner 27 above. The 26 sounds even smoother and darker than the Horner 27. I forgot about that as it has been a while since I played my 26 and 27 side-by-side. If you want smooth and dark, go with the 26.
A word of caution. This style of Horner melodica is very difficult to service (take apart, tune, and repair). If your going to buy one, ensure it is perfect or ensure you can return it.
Fortunately, there many pre-owned 26s available in good shape.
Lowboy