QoS: service policy within class-default?

I'm sure this has been discussed somewhere before. (I'd be grateful if someone could point me in the right direction if it has.)

 

This one shows two classes side-by-side under the same policy...

policy-map SHAPE
 class P2P
    police 8000
 class class-default
  shape average 5000000 160000 80000

This one shows the non-default policy as a "sub-policy" to the class-default

policy-map QOS_POLICY
 class P2P
    police 8000

policy-map SHAPE
 class class-default
  shape average 5000000 160000 80000
  service-policy QOS_POLICY

What is the practical difference between these configurations? Why would I choose one over the other?

Ta!

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