I have indeed read Cloud Howe and Grey Granite, but I think that Sunset Song is the best of the three. It must be nearly 20 years since I read any of them so my memory is not so good but I remember thinking that the author managed to express the feelings of a woman so very well. It is a great pity he died so young.
I am Scottish and I have relatives who live in the area that Lewis Grassic Gibbons writes about, but I don