Depends on your audience.
TikTok - to build brand awareness among a younger demographic, not the best for conversions. However, with the recently launched TikTok Shops, this migh change.
YouTube - when you want to advertise directly to your targeted audience using specific keywords and search intent. Great for B2B or B2C and converts well if your ad and CTA is done right.
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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