The Chinese 7.62x39 is fine. Better then Russian? Maybe, maybe not. But it’s cheap and widely available.
The Chinese 7.62x54r on the other hand I’ve had problems with: cratered primers, split necks etc.
As stated, Barnaul and MFS is Russian manufactured, non corrosive but it normally isn’t as cheap as the crates of surplus. I would try the EE or failing that #######, there is Czech, Romanian available on there on the regular, but the sellers tend to believe it’s made of gold, but if they are in you area, it might be a good option.