The phrase "six of one and half dozen of the other" is commonly used to suggest that two options are equally good or bad. However, there are many other synonyms that can also be used in its place. For example, "a toss-up" is a commonly used phrase to suggest that two choices are equally good or bad. "Two sides of the same coin" is another commonly used phrase to suggest that two things are so similar that they are almost the same. "Equally matched" is yet another synonym that suggests that two things are equal in every way and cannot be compared easily. Ultimately, there are many ways to express the concept of two options that are equally good or bad.