the yuba's cranks are more forward than the BD, and probably most any XC convert.
that is, the Yuba uses more of a "cranks forward" design, which can be found on bikes like Rans and a variety of "cruiser" bikes.
position of the bottom bracket, seat tube angle, swept back handlebars, all help to produce a particular ride experience. in that way the yuba is awesome.
I myself have a BD.
I built one for a friend
and his wife has a Yuba
they are a car free family with 2 kids, and two full time jobs.
while tim rides the BD, mindy like the yuba