I think probably The Survival Games 2. I have my most special Minecraft memories from that map. I remember playing it in a iMac in some random cracked server in 1.5.2, listening to my favorite Minecraft soundtrack... It was just beautiful.
(This is not my video, but I found the server I used to play in). Its funny they are also Spanish. I also remember even playing with like 7 classmates at the same time in the same game in Skype.
But in terms of playability and winning more games, I guess Alaskan Village or Turbulence.