Yah, tough choice.
If someone would have made Big World this year, I think there would be little doubt that it is not any kind of outstanding map to be featured, and probably nobody or almost nobody would be playing it (I guess). However, like in the case of fine wine, a map tends to be more popular if it is very old.
I'm thinking that maybe it is needed an other group like the "Axis & Allies style" where to put all those WW2 maps made in the very old times which have become TripleA staples just because of being so embedded into TripleA history albeit not being one of "those ones". The main two would be "The Pact of Steel" and "Big World". This from someone who actually likes none of them.