Tough call, right?
Here's a clue: The dress on the left is made from silk/spandex. The dress on the right is made from polyester/spandex.
Now do you know? Here's the answer:
The dress on the left is a flower swirl dress by Nicole Miller, $320.00 at Bloomingdale's. The dress on the right is a Nicole by Nicole Miller print sheath dress,
Since it's easy to tire of bold prints fast, we'd opt for the dress on the right. How bout you?