Nightcap is a very full and strong blend -lots of flavor,lots of nicotine. It's got too much perique and too much nic for my tastes. I don't smoke it at all.
MM965 has, IIRC, less latakia, no perique, and that sweetened cavendish thing. Personally, I do not care for that combination - so I don't smoke it, either.
I'll go for Standard Medium when I want a good hit of lat and not much on the orientals. If I want more orientals, it's MM1938, which I find much more interesting than London.