'Largest or Large' is aptly used with the quantity words:
Large scale, Large amount, Largest Army, Largest city (considering area), Large quantity of, a large proportion, to a large extent', Largest Economies, Large volume, Largest group on face-book and Longest (as Identical).
'Biggest or Big' is one of most commonly used word both in oral and written form:
As highest - Biggest building or biggest tower in the world.
As Important - Biggest decision of my life.
Many Fixed phrases - Big ideas, not quite a big deal, biggest mouth, very big.
Miscellaneous - The biggest changes in NASDAQ, Biggest Loss, Biggest Loser.
Hope this may help you!
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