In Australia we eat mutton a lot, and a lot of lamb is really well um mutton dressed as lamb
I prefer mutton especiallly in a strongly flavoured dish as the delicate flavour of lamb can get over powered by spices and herbs.
In England where I now live, the Asian (Indian, Pakistani and Bangladeshi) communities love and adore mutton, and it is quite difficult to find. Of course all their cooking of lamb and mutton is in curries, and they much prefer the stronger flavoured meat.
On a side note, in Tasmania, the little island that I come from there is the mutton bird. It is hunted by Tasmania Aboriginal communities on Cape Barren Island in Bass Strait something they have been doing for generations. Mutton bird is d.i.s.g.u.s.t.i.n.g!!!
My grandmother would relent and cook it for my grandfather. My grandmother was a very traditional Australian farmers wife, and never used to open windows in the house (to keep flies out) Once a year, every window in the house would be open, and the front and back door, and you could smell the stench of the boiling bird right around the street corner.