WHO?: French sculptor, best known for "The Thinker" and "The Kiss."
PROS: Naturalistic style has aged well. His sculptures have become iconic. Never destroyed a city.
CONS: "The Thinker" and "The Kiss" are so ubiquitous that they can feel a bit cliched. No superpowers, and therefore unable to destroy a city.
WHO?: Japanese reptilian monster.
PROS: Highly agile; can create hurricane-speed winds by flapping wings. In one film, sacrificed own life to save Godzilla. Able to destroy cities.
CONS: City he destroyed was only Sasebo. Extremely inconsistent; sometimes good (helped Godzilla and Mothra defeat King Gidorah), sometimes bad (that whole city-destroying thing), sometimes downright inexplicable (a dead Rodan is revived by a psychic singing plant in one film). Caves easily to peer pressure (the Kilaaks were able to control his mind to do their bidding in one movie; the Xilians did the same in another). Very bad breath, which is sometimes radioactive.
WINNER: While no Godzilla, Rodan could still kick Rodin's ass.
(Some basic Rodan info here; Rodin info and images here.)