Suede chukkas are my favorite type of casual shoe. If I only had 2 shoe styles available to me, it would be a black captoe oxford for suits, and a brown suede chukka for everything else.
I like mine unlined - they feel great and somehow add to the casual look/feel.
I have the Crockett & Jones unlined chukkas in snuff and dark brown. If I had to choose between them I would pick the dark brown. They go with everything.