Atlas Park – One of the two starting areas for heroes. Generally the more popular of the two because it has access to the sewers where people can quickly level to 10 after creating their character.
Because it's not very flat, travel in Atlas can be a pain at early levels so if you want to follow story arcs, Galaxy might be better. However, if you are playing a Peacebringer, your special contact is in Atlas so that's another good reason to start there.
Also noted for having the city representative who is the source for missions that unlock capes and auras for costumes and also the Super Group registration.