Rayburn and Chieftain compared? (looking for a low G)

I’m in the market for a low G, and am very happy with the Chieftain low F I’ve got, but am thinking about something else as well to have some variety in tone/feel/etc.

Any comparisons in terms of tone/volume between the lower whistles (not just G) with Rayburn and the Chieftain? Any other brands to recommend in low G?

Thanks!!

-Mark