What is the healthiest sausage to eat?

So, when it comes to choosing the healthiest sausage to consume, one must consider several factors. Is the sausage made from high-quality, lean meat? Are there any added preservatives or fillers that may be detrimental to one's health? Are the fats used in the sausage healthy, such as those from unsaturated sources? Additionally, are there any spices or herbs used in the sausage that may offer health benefits? With all of these factors in mind, what would you say is the healthiest sausage to eat and why?