I love both these shows. I discovered Downton Abbey on Netflix, watched all of Season 1, then bought Season 2 from Amazon for $12.00. I try not to miss the new episodes. My favorite characters? Are any of them really "likeable?" LOL! Maybe Daisy or the head housekeeper. I'm not a fan of the Rich, and although I love the show, I don't find most of the characters Upstairs to be very likeable. Their worlds revolve around their pretty little heads and don't extend much beyond there. (Yes, the Abbey was turned into a recovery hospital during WWI. But, this was really expected of the Rich back then, and my guess is they did it to keep up with others in their "class" and not be considered selfish. I see little that the people Upstairs do that isn't concerned with their own comfort and their own little Rich worlds. Interesting, but not really likable.
Cora seems the most likable upstairs. That she takes care of older servants when they are sick is commendable. She also talked her husband into getting a lawyer for Bates, the valet, but a lot of good it did. The Lord of the manor (can't remember his name) did stand up for his valet, as well. But, in a "he's my servant, and always has been" way.
I do find the interplay between the believed in "classes" and belief systems of the Manor House age interesting.
As for Call the Midwife, I like the characters. They are likable. I have read the book and the series really expands on the book while staying mainly true to it.
I was watching Call the Midwife with my youngest daughter and she said, "Mama that's kind of what you do." Similar.