Chinese makes sense. Which at least makes it easier for me. I mean like if your language beforehand is english or any of the such. ofc it's like one of the hardest bc of tones. But the grammar structure makes the most sense out of the three East Asian languages which honestly makes it slightly easier in the long run.
Ofc there are much much easier languages. But Chinese isn't as hard as people think it is.
But if you want a really easy one. Just learn Esperanto lmfao. If you know English, French, Spanish, or literally any western language. This should be very easy.