I liked Angela Lansburry as Miss Marple. I also like Geraldine McEwan as Miss Marple, but I simply hated the adaptions. At Bertram's Hotel was disgusting. They created a new and awful story. I think only The Moving Finger and A Murder is Announced are fairly good. The others films, please, don't watch them!I think Julie Mckenzie is a great Marple and the films were usually fine, especially Pocket full of Rye. She is very gentle and polite and quite smart. On the other hand, Why they didn' t ask Evans couldn't had be done. It was not even a Miss Marple book to start.Unfortunately, I watched just two films with Joan Hickson as Marple. I liked a lot. She is a cute Marple. Very cozy and clever.I think it's really difficult to pick one. It depends not only on the actress, but also on the others actors, the script, if you like or not the original story and so on.
One of the things they did badly was to give Margaret Rutherford the role of Miss Marple in a Poirot story, and then in a non Agatha Christie narrative. I think viewers wer annoyed by it.