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Much easier to pressurize and keep airtight than something with 90 degree angles.

That's why the ISS is shaped the way it is, cylinders joined with circular joints.

Probably same reason why pipes are round, and propane tanks are hemispherical on the ends. Under pressure / vacuum, corners are stress risers, and flat sheets have to be supported.

They have great properties around wind flow and structural support of the roof system. In a concrete dome house, the roof and the vertical supports are one continuous structure - so no more hurricane blowing off your roof. The building technique is exotic but not hard - one approach is to inflate a plastic sheet into a dome shape and the. spray concrete on the inside to build up the outer shell. Check out this example, which keeps the open garage on the ground floor so that there’s less load from wind on the structure and so the living quarters won’t get flooded: https://youtu.be/n7CjYhKBjtU

Biosphere vs biocube

Bio-dome, Buuuddee!

https://en.m.wikipedia.org/wiki/Bio-Dome