X-rings are billed as being able to hold lube better and last longer, but honestly your maintenance & bike storage environment is much more important. Sounds like you're already doing a good job, with 20K on the previous chain.
Most important thing is to store it indoors, keep sand off the chain, and keep the rings lubricated so they don't wear out, allowing the internal grease to escape.
BTW, WD40 is not a lube.....Some people use it to clean, but it doesn't lube worth a dick, and it also contains solvents which if it ever penetrates past the rings, would mix with the internal grease and quicken its demise.
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