I do have the tectonics mapmaker, but I can't play on maps bigger than small until my video card starts working, so I'm sticking with the entirely land-based map styles (Oasis is my favorite, but Great Plains and Inland Sea are good too). Oceans bad!
RON had several different map styles which dramatically changed the game played. There was
East Indies (archipelago)
East v West (teams on different continents)
African Watering Hole (plains, with resources clumped in the center)
Amazon Rainforest (mazes of jungles)
Himalayas (tons of mountains and forests)
Mesa (open spaces with mountains, few forests)
and a bunch of others