It's not favourite popular within the zombie community however one of my favourite zombie maps has to be Shangri La on black ops 1. It was just the whole layout and the features on it that makes me like it more than the others.
In BO2, I really like the farm. I prefer just to kill zombies. In other words, I like maps that are just straightforward, than just building parts just to progress to the level(tranzit.)
BO1: Kino & Ascension
BO2: Die Rise & Origins
Went to round 69 on Die Rise lol.
Sometimes these maps get boring when you play too lonnng.
Alcatraz is one of my fav too cause of the music, but it's too easy. I got bored playing solo on round 50+ basically doing the same thing every round, gets boring sometimes.