None of the above.
Firstly, we all have our own strengths and weaknesses. Yeah, everybody's lower back is stronger than their biceps, etc. But that doesn't mean everyone has the same ratio.
Then training comes in. If you spend your whole life curling and doing nothing else, then your biceps are gonna be disproportionally strong. But it doesn't make it a good indicator of overall strength. No one exercise is.
The only thing exercise really can measure is how big your balls are -- e.g. how many times you can squat 80% of your 1 rep max before you go crying for momma, etc.