The choice of dome size really depends on resouce availability and density. If starting location has poor resouce, small dome is a temporary solution before readily moving to a better location for bigger sized dome for permanent population center.
If the initial location has ideal resource mix, med sized dome may be an attractive transition for a farming dome to take advantage of the water conservation spire. Jumping directly to Mega dome may stretch resouces too tight in high difficulty high disaster map.
If the initial location has ideal resource mix, med sized dome may be an attractive transition for a farming dome to take advantage of the water conservation spire. Jumping directly to Mega dome may stretch resouces too tight in high difficulty high disaster map.