Unfortunately, there’s really no easy way to record for Chinese if the user isn’t already familiar with it. Mandarin Chinese is a particularly esoteric language with a lot of unusual combinations of sounds that don’t appear in many other languages. It’s not as phonetically simple as say, Japanese, Spanish, or Korean, and it will almost certainly require some practice before recording, regardless of what format you use.
To actually answer your question - CV Chinese would almost certainly be easiest. Despite its relative phonetic complexity, it is a CV-esque language like Japanese, and CV Chinese would only require you to record each syllable only once per pitch. If you understand the pronunciation, it should be pretty short and compact to record.
Other than that, the only other major method is CVVChinese, which is generally a pretty beefy format, and probably not the best to start with. There’s also VCV Chinese, which is, frankly, a bit impractical for most cases, due to its absurd size.
Not to self-advertise, though I also had been working on my own format for Chinese too, that I still intend to release eventually. It’s a relatively short list that’s in-between CVVChinese and CV Chinese in terms of length and difficultly. It’s pretty much complete, and I also wrote and included a pronunciation guide for it catered to non-Chinese speakers, if that interests you.