Originally Posted by smashndash

Having lower bars allows you to ride in a lower position with straighter arms, something that works better for going fast over long distances. It allows you to have straighter arms while descending - this reduces stress on your elbows. It allows you to sprint in a more aerodynamic position.

So essentially - a lower bar position facilitates a low torso angle better than a higher bar position. What you need to ask is “how often am I riding with a low torso?”. If you are frequently bending your elbows like crazy or climbing in the drops, chances are that you’d be more comfortable with a lower bar position.