Everybody is saying both - I agree with that.
I also understand you have to pick one first, otherwise, it is just too overwhelming.
If your product is something that needs a bit more in-depth overview and can benefit from a longer form (TV-like) format then start with YouTube.
If your content is wittier and your product can benefit from short-form, possibly humorous content - TikTok.
Eventually, you're gonna do both.
Depends. TikTok is easier to get traffic but it's very hard to find customer. Youtube if you will do it correctly will give you more customers but it's very hard to get traffic :)
It really depends on your goals and audience. For example for my company (we developing a JavaScript library for web reporting), YouTube is the best platform for sharing tutorials, tips, and tricks.
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