When I was little, I loved Winnie the Pooh and must admit that I still do. (Can't stand the Disney version, though.) A. A. Milne was very perceptive regarding character and I know a lot of people who resemble the denizens of the Hundred Acre Wood. Personally, I am a Kanga married to a Rabbit.....
I also loved some books which aren't so well known, such as "Wishing Water Gate" which I read whenever I was ill (which was often) and "Hobby Horse Cottage" which I borrowed frequently from the library. I think that the latter was written by Miss Read, who also wrote for adults.
Wasn't keen on Enid Blyton and particularly disliked Mallory Towers, as the idea of boarding school filled me with horror. I did like the Narnia books, and anything by Rosemary Sutcliffe or Henry Treece. I may have spelled his name wrong but he wrote some very good historical novels for kids.