I would take moons (i think?) since the heat from the suns would melt everything on the planet (depends on distance) but the moons you'd at least be able to protect yourself from the cold they cause.
Umm
A planet with hostile aliens or a Planet with living mud?
Excuse me, but would you update the game, please? The devs wrote the update info on the description, instead of the dedicated update log. 敗北の追憶 ヴルツェルシスターズ to ver1.0.1