I'm between a 9.5 and 10 and C and D on Brannock.
9.5D Strand is a bit snug (mainly in the width) but not a problem; but I don't think a 10 would be too much slip with the of lacing of that model.
9.5D in Higgins Mill is a great fit. I think 10 would be too roomy on that last.
I have a 9.5 Northland and that is almost too big, but I don't wear socks with those.
Is 9.5D or 10D the way to go on these?
BradSI am a 10D on most things in Allen Edmonds -- McAllister, Strand, and Newberg. I bought a 10D, I'm pretty happy with it, right amount of snug, and I wear thin socks.
Hope that helps.