Theta is a creative world made for greens, so map-making would be easier (and won't take months to gather materials).
Specifics about Theta World
Theta is a creative world, which can be warped to with /warp theta for green or higher ranks. The world size is 12k on all sides. Theta is generated with a normal minecraft world, namely from version 1.12.2.
Maps that are currently in Zero will likely stay in Zero, unless the map creator wants to make changes to them. A player can request for a map transferred from Zero to Theta. Because of the creative addition to Theta, maps will rise in the aesthetics required to pas into FFA.