Is a whale or dolphin prettier?

This question is a matter of personal preference and opinion rather than objective fact. Therefore, there is no single, correct answer. Some people may find whales more handsome, while others may prefer dolphins, just the same way someone may think dogs are prettier than cats, and vice versa. It ultimately depends on individual aesthetic judgments and personal taste when making a comparison and declaring one prettier than the other. Therefore, the prettier designation will vary from viewer to viewer.