Cobs and burley do seem to go together very well,but they smoke virginias equally as well. I think a lot has to do with the open draw and how the cob breathes.IMHO
On those occasions that I partake of a Burley or aromatic tobacco, I always use a cob/maple/cherry pipe. I have smoked Burley in my clays; they seem to "match' well also. FTRPLT