Based on our record, Speaking.io seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
A youtube course will not be as helpful as really talking in front of people. At the end of speaking.io there is a great video on public speaking. Additionally, you can try courses on Udemy (there are a lot). Source: about 2 years ago
Ps - in addition to Seth Godin's advice, I got a lot of value out of this: https://speaking.io/. Source: about 3 years ago
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