What's the best mix of new Shimano XTR, XT, and SLX?

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12-speed Shimano XT and SLX is here and it's almost as good as XTR

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Shimano SLX Vs XT Vs XTR Groupsets, 45% OFF

Shimano Drivetrain Comparison - XTR vs. XT vs. SLX vs. Deore

XTR has same weak spots as XT, SLX and Deore. Bike Service School - all about Shimano rear mechs.

Shimano Deore & XT LinkGlide MTB group is 3x more durable - Bikerumor

Best mountain bike groupsets explained and rated by experts - MBR

Shimano 12-speed goes (more) affordable with M8100 XT and M7100 SLX groupsets