Talah Market is my favorite at the moment. I really like all of them though and I would have to say Epicenter is my least favorite. Once I get the maps memorized I am sure I will like them even more.
One thing I have not seen any one mention is the numerous pathways marked with a blue door with a red propane tank next to it. I was pleasently surprised by these and I think they rock, who would not like more avenues to flank with?