None of them. Benzos helped my stutter by around 85%. Also, copying the way another person talks helps, as it seems to feel similar to how the brain and speech connect well when singing, with no stutter. Like say I like or am familiar with how a certain person speaks, or I've been binge watching certain TV shows...like Seinfeld for instance, I start to speak like Jerry (I'm an Australian woman, but whatever. lol). Lately I've been watching Poker Face and often find myself talking like Natasha Lyonne. No stutter. Also, speaking to a webcam while looking at myself helped before the above two things did, though the more I got used to it, the more the stutter would come back.