i think most people agree that if you're riding drops with good (modern) ergonomic brake hoods/levers, you've got about the same thing as a pair of chopped bullhorns, plus the drop position. the only reason people like chops is they're cheap (crappy drop bars are a dime a dozen, but comfortable brake hoods are a bit more expensive), and its more a part of the fixed gear esthetic to have bullhorns.

so if you are just going for the commuter functionality, id go ergo drops and nice modern levers. if you're going brakeless fixietastic id go with risers, though the flip and chops wouldnt be a bad second choice.