Marmalade and Cocos2d-x

I’ve just come across this: https://www.madewithmarmalade.com/ and it looks amazing.
https://www.youtube.com/watch?v=NWOKVCbB8JE

Looks like it’s got all the features Libgdx has, but with more successful commercial games out there made with Marmalade.

My friend told me about this today: http://www.cocos2d-x.org/ which also looks good.

What do you guys think? Better than Libgdx? Other alternatives to these frameworks out there?

Personally I’m fine with Libgdx, but it seems like there’s a lack of tutorials on integrating platform specific services such as Admob and Game Center (iOS). I got everything working eventually, but after all that, I really don’t want to experience all that headache again, so I’m looking for an alternative.