We know that power schema is deprecated. It seems that there are two alrernate schema - powersubsystem and powersupply. However, two of them have properties - power supply. I would like to know which one is better.
As you noted "Power" is deprecated in favor of "PowerSubsystem". Both contain the property "PowerSupplies", but in the deprecated "Power" resource, power supplies were modeled as an array of objects. We've learned since then that this was not the best approach to model power supplies, so in the "PowerSubsystem" resource, they are represented as individual resources in their own collection; this is the preferred method.