Well. I played almost all official, so I have to tell, that most fun I have with fan map Slovakia

From officials, every one have something. You are limited to specific rules of map, because (except of Slovakia map) expansion tiles are play as vanilla tiles without displayed expansion features.
As your are new comer to maps, maybe start with C3 maps Germany or Nordics.
But wait for other recommendations, because I have more fan tiles like officials so I'm not good advisor
