The percentage of assetmethod requires more work because frequent portfolio monitoring is needed to determine when asset classes move outside of their tolerance bands.
Because the asset price method can lead to inappropriate results for goods that are purchased largely for investment reasons, the CPI implemented the rental equivalence approach to measuring price change for owner-occupied housing.
The asset allocation recommendation under the Cosmo method is about as useful as a questionnaire to determine if you should have dated the person that just walked out the door.