Currently we can't really say if bo1 zombies or bo2 zombies is better because there are still 2 dlcs to come. At the moment i'd say bo1 zombies is winning but these upcoming zombie maps for bo2 could be really amazing. On buried I'm hoping for cool buildables, traps and dynamic elements to the map like rideable minecarts. In DLC 4 I'd like to see the old characters back, all the perks and would like the map to be a snow map because we don't have a zombies snow map in bo2.
Finally i'd just like to say that MOTD was an excellent recovery from that horrible mess or as others call it. Tranzit.