To be honest, I just get the cheapest x ring chain for my bike. It's a once a year replacement anyway as I do 30+k per year. To be fair I'm not that conscientious about chain maintenance on a daily dike that gets wet often. I just replace it once the links get kinked up or stretches beyond  3 adjustments.

My OEM O ring DiD chain on my NK lasted about 25k before I replaced it with a RK x ring 520. Tbh, I don't expect the RK to last beyond 30k either. For 180 a set, I just factor it in my annual maintenance cost. For my usage, I change the sprocket for every 2 chains