What is referred to by 'better than better'?

Based on the clue 'better one are heads than two', what is the answer? Based on the clue 'better take a deep breath before you do an underwa...', what is the answer? What is referred to by 'better than pound'? Based on the clue 'better than a cat scanner this technique is used t...', what is the answer? Based on the clue 'better the foot slip than this body part', what is the answer? Based on the clue 'better the foot slip than this', what is the answer? Based on the clue 'better to be king for a night than a schmuck for a...', what is the answer? Based on the clue 'better to be the head of a dog than the tail of th...', what is the answer?