I can't speak to the PNS Substrate Sauce but I liked their PNS ProBio. I can't swear that it did anything positive but it felt like it did. If nothing else it has a fairly impressive stench.I don't really have a preference. I actually used Fritz Turbostart to cycle my rock initially when it was cooking for all those months in the garage. I have also added the Dr Tims, Microbacter 7 and Sachem Stability at different times. I like to think I'm adding some diversity by using different brands over time but who knows, it might all be the same. I did just order some of that PNS Substrate Sauce live starter bacteria as well. That seems to be new and different with some positive reviews but again, who knows. Since I'm having trouble figuring out the source of my problem I think having a wide variety of possible solutions is good. Or not and I'm making it worse, lol.