Roll Up help on % of Budget for all activities

I have several questions...they may be related. I am not sure.

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I have an active schedule with all activities set to 1 for Budget Labor hours. All resources are set to $1 per hour. I can see the total budgeted hours for the project for example 1000 hrs total. We are partially through about half of the overall work. All activities are set to "Duration % complete". 

Which roll up should I use? 

"Activity % complete" does not do a roll up.

"Duration % complete" shows 53.97%

"Labor Units % complete" shows 63.17%

"Performance % complete" shows 57.71%

"Physical % complete" does not roll up

"Schedule % complete" shows 49.67%

"Units % complete" 63.17%

Can someone help me understand the differences?

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I am showing the following columns in the upper area:

Budgeted Labor Units

Actual Labor Units

Remaining Labor Units

Earned Value Labor Units

Why is "Actual Labor units" slightly different from my "Earned Value Labor units"?

Why does "Budgeted Labor units" subtracting any of the other 3 columns not equal any other column?

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When I show the Activity Usage spreadsheet below I can see the following columns :

Budgeted Labor Units

Cum Labor Units

Actual Labor Units

Cum Labor Units

Earned Value Labor Units

Cum Earned Value Labor Units

Is there a roll up that will show % complete to the WBS summary levels?