Brakes - I feel these work better in steep/high speed setting (comparing 2-piston XT vs Guide), easier maintenance (mineral oil plus no need to fuss with two syringes). Fork/Shock - honestly: mostly for Kashima looks :)
I have both Rockshox/SRAM Meta 27.5 and Fox/Shimano Meta 29 - will go with Signature again, assuming both builds will be available at the same time. If not - will go with whichever is available sooner.
melmark woody12 no brainer for me - Commencal is better speced, does not have proprietary shock mount and costs less money. Especially if you going for blind purchase anyway.
So, Commencal is still waiting on Shimano to allow them to start selling new products. But bikes are on their way to Colorado, and hopefully should get there by end of September.