There is no definitive answer to this question as it depends on what you are looking for in a shotgun round. For example, if you are looking for the most powerful option then you would want to choose a round like the 12ga Flechette which packs a huge punch. Alternatively, if you are looking for something with more range then you might prefer a slug like the 12ga Slug. Ultimately, it really comes down to personal preference and what you need the shotgun round for.