From Hurricane-Resistant House Design :
Hip roofs are the best design for high winds, but are more expensive to construct.
Gable roofs are acceptable and less expensive.
The pitch of the roof should be at least 30 degrees (approximately 1 ft increase in elevation for every 2 ft in the horizontal direction).
Flat roofs should be avoided completely.
It doesn't say anything about round homes or domes, but I would think that they'd be best.
My husband and I built our home ourselves. The inspector told us that if our roof goes everyone in trouble. We kind of got carried away with hurricane straps:')