i have troubles in assessing the building energy efficiency index

i have troubles in assessing the building energy efficiency index, as
i know , there're following  kinds of ways or indexes :

1.building envelope
OTTV(Overall Thermal Transfer Value),
PAL(Perimeter Annual Load), 
U-Value

2.facility or equipment
CEC/AC(Co-efficient of energy consumption for air conditioning )
EER(or SEER)
COP

my question is what's strongpoit and lack of each index?

thks!