How to Get the Most Out of Your Probiotics

i want to get your insight about what works best, when, if there's a place for all of them. Let's dive into probiotics, cause you are one of the experts around this. And then taking even one step further, there's this idea of fegal transplants. So this is this, or what i'm trying to do it sort of describe the the entire scope of this probiotic field. If there's one that's your favourite, where do you go first?