NAMOR is an anagram for SHELL (joke if you missed it).
I own both the JL William and Westminster. The latter definitely has a finer look. My William is Buffalo calf so it's more casual. To me, it's like comparing the Shannon with the Galway. Both are great boots but one just has sharper lines (okay, I know the former is also a balmoral).
I own a number of DM and I prefer them over single monkstraps actually. YMMV.