Advantage - Most techonologically advanced nation in the Avatar world. Not much is known of the Fire nation. Most [not all] of the citizens feel extreme nationlism for their nation and loyalty to the Fire Lord.
Disadvantage - Not much in known about the Fire Nation. The nation's many volcanoes may erupt and destroy your homes. If you're not a native or you're not a firebender, you could be thrown in prison or even killed. The citizens are also under the tyrannical rule of the Fire Lord. All-red clothing and buildings.
North Pole
Advantage - You will experience a strong sense of community. If injured/sick, powerful healers are ready to fix you. Incredibly beautiful scenery/architecture with Venice,Italy - style transportation. There's an area with a strong connection to the moon and ocean spirit. Currently, women can now learn waterbending for fighting.
Disadvantage- May experience gender inequality. Labor is divided by gender. Arranged marriages can be a problem. Freezing cold temperatures. All-blue buildings and clothing.
South Pole
Advantage - You will experience a strong sense of community. In a rebuilding process with the help of some Northern water tribe people. Not that much gender inequality as compared to the North Pole.
Disadvantage- Population dwindling to brink of extinction. All-blue buildings and clothing.
Ba Sing Se
Advantage - Last stronghold in the Earth Kingdom against the Fire Nation. Reliable system of transportation. Lots of farm land for food
Disadvantage - No Fire Nation soldiers to harass you, BUT people separated by social class. People live in fear of the Dai Li. Free speech is suppressed. Brainwashing is a problem. Mostly all-green clothing
The rest of the Earth Kingdom
Advantage - Diverse animals. Lots of beautiful places and scenery. Diverse environments and climates. You may be safe from an invasion depending on where you are
Disadvantage - You either are in Fire Nation occupied territory or you constantly live in fear of a Fire Nation invasion. Fire Nation may/can be abusive of their occupied territories. Earth kingdom has incompetent/crazy generals and/or abusive soldiers. Mostly all-green clothing
Air Temples
Advantage - Lots of history about the Air Nomads. You may find other refugees.
Disadvantage - You either are in Fire Nation occupied territory or you constantly live in fear of a Fire Nation invasion. Some of temples are empty.
Edited 4 total times.