In short: Micro domes and barrel domes give you (a lot) more space at a similar price, and the ability to have a spire in a basic dome is almost always negligible.
In depth: 2 micro domes, a basic dome and a barrel dome have almost the same upkeep (1 oxygen, 1 water and 10 vs 15 vs 15 power). However, 2 micro domes will give you 66 hexes of space, the basic dome will give you 60, and the barrel dome an incredible 86 hexes of space (see here), making almost as large as than the trigon dome (90 hexes). This is at the cost of polymer maintenance and the inability to support a spire. Considering the polymers, I would argue that if you are hard pressed for advanced materials, you should stick to micro domes in the first place. Which leaves the advantage of the basic dome being able to support a spire.
However, you have to ask yourself in which situation you will actually want a spire in a basic dome.
Water reclamation? If you "outsource" your work force via a dome connection, you can fit 5 farms and 3 hydroponic farms in a basic dome. However your workers will all work at -10 performance (unless you play brazil), and you will not need 5 farms until the mid game, at which point you will likely have a medium dome anyways.
Medical center? One of the best options IMO, but again, a medical center for one basic dome is overkill, connected domes will suffer a service penalty, and when you have medical centers you will often also have medium domes.
Arcology? If you use the additional space of the barrel dome for 2 living complexes + 2 living quarters, you will have 4 more living space than a basic dome + arcology (36 vs 32), at a vastly lower price. Arcologies look cool but are almost never efficient, same as appartments. I would only use them at a great dome site (multiple vistas/research sites).
Which leaves hanging gardens (late game + waste of dome-wide bonus), network node (same), temple spire and sanatorium. The last two are the only ones I would actually build in a basic dome -- but they are restricted to church of the new ark, and the late game, respectively. I do not own the in-dome building pack, so I cannot comment on the school spire, but I would again suspect it is of no concern until at least the mid game.
So, to conclude: Unless you are church of the new ark, your early game domes should be micro dome (when low on polymers or people) or the IMO fantastic barrel dome. The "basic" dome should really be seen more as a small spire dome, and is pretty situational even in the late game.
EDIT: There was a mistake in the paradox wiki: 8 large and 2 medium plots is 86 hexes, not 96. I edited the wiki, hopefully it will stay.
In depth: 2 micro domes, a basic dome and a barrel dome have almost the same upkeep (1 oxygen, 1 water and 10 vs 15 vs 15 power). However, 2 micro domes will give you 66 hexes of space, the basic dome will give you 60, and the barrel dome an incredible 86 hexes of space (see here), making almost as large as than the trigon dome (90 hexes). This is at the cost of polymer maintenance and the inability to support a spire. Considering the polymers, I would argue that if you are hard pressed for advanced materials, you should stick to micro domes in the first place. Which leaves the advantage of the basic dome being able to support a spire.
However, you have to ask yourself in which situation you will actually want a spire in a basic dome.
Water reclamation? If you "outsource" your work force via a dome connection, you can fit 5 farms and 3 hydroponic farms in a basic dome. However your workers will all work at -10 performance (unless you play brazil), and you will not need 5 farms until the mid game, at which point you will likely have a medium dome anyways.
Medical center? One of the best options IMO, but again, a medical center for one basic dome is overkill, connected domes will suffer a service penalty, and when you have medical centers you will often also have medium domes.
Arcology? If you use the additional space of the barrel dome for 2 living complexes + 2 living quarters, you will have 4 more living space than a basic dome + arcology (36 vs 32), at a vastly lower price. Arcologies look cool but are almost never efficient, same as appartments. I would only use them at a great dome site (multiple vistas/research sites).
Which leaves hanging gardens (late game + waste of dome-wide bonus), network node (same), temple spire and sanatorium. The last two are the only ones I would actually build in a basic dome -- but they are restricted to church of the new ark, and the late game, respectively. I do not own the in-dome building pack, so I cannot comment on the school spire, but I would again suspect it is of no concern until at least the mid game.
So, to conclude: Unless you are church of the new ark, your early game domes should be micro dome (when low on polymers or people) or the IMO fantastic barrel dome. The "basic" dome should really be seen more as a small spire dome, and is pretty situational even in the late game.
EDIT: There was a mistake in the paradox wiki: 8 large and 2 medium plots is 86 hexes, not 96. I edited the wiki, hopefully it will stay.
Last edited: