Definitely TikTok. Engagement is significantly higher and it is easier to get people to your website. This statement applies to German and English-speaking countries.
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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