I'm partial to field roast or Beyond sausage, but I've made this with Impossible sausage. You need to choose whatever sausage you like the taste of for this soup recipe. The only downside with meat alternatives is that they tend to be higher in sodium, but as a dietitian, I don't have any issues including them in my overall nutritious diet a few times a week. As I often get questions related to the health benefits of fake-meat, I highly recommend reading this SWAP-MEAT trial from Stanford researchers which demonstrated that compared to organic, grass-fed meat, the plant meats improved several cardiovascular disease risk factors.