WS-20 is almost ready, the program has been more than 10 years, CJ-1000 began much later and still has a long way to go, PLA can not wait.
CJ-1000 is more advanced, trying to match LEAP on both noise and fuel efficiency because C919 is going to compete A320NEO. For that reason, CJ-1000 has foreign assistance, I remember MTU aero is involved. I don't know if the foreign element of CJ-1000 will prohibit its early adoption by PLA. Even if that is not an issue, it is simply too late.
