Romanesque
Radiating chapels and apse: Separate compartments.
Vault: Mostly barrel-vaults, some groin-vaults.
Arch type: Rounded arches.
Main vault support: Thick walls, buttresses.
Clerestory: Small windows.
Elevation: Horizontal, modest height.
Exterior: Plain, little decoration, solid.
Sculptural decoration: Thin, elongated, abstract figures.
Mood: Dark, gloomy.
Example: St. Sernin, Toulouse, France.
Gothic
Radiating chapels and apse: Unified, unbroken space.
Vault: Groin-vaulted cathedrals.
Arch type: Pointed arches.
Main vault support: Exterior flying buttresses.
Clerestory: Large stained-glass windows.
Elevation: Vertical, soaring.
Exterior: Ornate, delicate, lots of sculpture.
Sculptural decoration: More realistic proportions and individualized features.
Mood: Tall, light-filled.
Example: Chartres Cathedral, France.
;-)