I haven't heard of the 2 you mentioned here. But I have found a pretty good one. I had a really bad stutter and I was able to overcome it with their help. I started by watching their Youtube videos which helped me a lot. And after about 4 months of watching their videos, I decided to reach out to them for more personalized help. And I've made A LOT of progress so far I always judge how good someone is at what they do by how much free helpful information the share with others. So you should check out their Youtube channel and watch their videos to see if their approach resonates with you.