I have read many Philip K. Dick books and liked nearly all of them to various degrees. The Crack in Space sucks though, and The World Jones Made doesn’t really hold together, but at least I enjoyed reading it. Eye in the Sky and Time out of Joint are the two best that I didn’t read out of one of the first two Library of American collections (I haven’t read the third).

Regarding the two you actually asked about, I like them both. I think that Do Androids Dream of Electric Sheep is better and more representative, but only after Bladerunner came out did it become more popular than The Man In the High Castle, which was the best known and most popular PKD book while he was actually alive.

The single best selling edition of any PKD book is the one that uses Blade Runner as the title and the actual title as the subtitle, and that has the move poster on the cover.