A: Hey PaoloC,
I'll paste the same answer that I gave for another user around this subject:

Altho we have some similar tools, it's not the same purpose.
First, right now Biteplay isYouTube only, but soon we're adding more social platforms.

Tubebbudy seems to focus on SEO and management of your channel,
while Biteplay is focused on research, advertising, and creators.

You can use Biteplay to grow your channel by finding trend topics, similar audiences, making co-labs, finding similar creators, tracking keywords of your interest, spying on other videos and channel performance, creating advertising, and more.

We're adding more SEO tools inside Bitepaly, but don't expect Biteplay to mimic other features because we're most focused on innovation.
Example: We don't have keyword search volume, but we show you a keyword volume view (because it's YouTube and makes more sense lol).

To sum up: we are different, most likely you'll have both on your arsenal! =D

Hope that helps!