The maturity level is about the same.
which is better: chess.com or chesskid.com?

I've only been with Chess.com one thing for sure they have lots to offer and great tournaments not only you can play in but watch such as the speed chess championships featuring Magnus vs MVL with your Chess.com subscription. The thing is you already know where you plan to go

chesskid is cool to though... not as cool as chess.com
I agree that their vids are the greatest but I am with chess.com because you can't challenge random people if you want to play against them for starters and you can not message and you can not do puzzle rush and a billion other stuff! How is it cool? Maybe the design is good (for a while) but it gets boring over time!
I've only been with Chess.com one thing for sure they have lots to offer and great tournaments not only you can play in but watch such as the speed chess championships featuring Magnus vs MVL with your Chess.com subscription. The thing is you already know where you plan to go
Actually, you can easily go to twitch.tv and watch the speed chess championship there, no need for a membership.

chesskid is cool to though... not as cool as chess.com
I agree that their vids are the greatest but I am with chess.com because you can't challenge random people if you want to play against them for starters and you can not message and you can not do puzzle rush and a billion other stuff! How is it cool? Maybe the design is good (for a while) but it gets boring over time!
you can do all that in chesskid
I think chess.com is better