I heard that e-CNY is very advanced in the world, and there is not much experience to refer to.
What do you mean by "advanced"?
Technologically speaking I haven't seen any technical details of it for anyone to give opinion on its advanced-ness.
However, adoption wise it seems to be doing fine. They claim to have surpassed 100 billion yuan last month. So there should be a lot of experience there to refer to.
I sincerely hope that Bitcoin will develop better.
Bitcoin is already better by being decentralized and censorship resistant.