Reyburn Low Ds

Have a Reyburn WB - low D and wondering what the difference is between it and the NB. Would appreciate comments from anyone who has played both of them.

I am very happy with the WB but wonder what the NB has to offer.

Sold some things .. thinking of another whistle but I can resist …the urge will pass … maybe … possibly .. perhaps … ahhhhhhhh!!!

Jim