This could be achieved by finding which one is right and which one is wrong, by finding that both string theory and loop quantumgravity are wrong and a third theory is right, or by finding that the two theories can be unified.
And we might be provided with clues that reveal the trail to unraveling the ultimate holy grail of fundamental particle physics -- a quantumtheory of gravity.
With a quantumtheory of gravity, we may be able to trace the Big Bang expansion back to its very beginning, and understand precisely how our universe arose, presumably from nothing.
Einstein's framework for his theory of gravity, for example, is incompatible with quantumtheory, which explains how nature works at an atomic and subatomic level.