What is the competitor's biggest strength?This question is the sixth of several questions I've enumerated that a product manager should answer to most effectively position a product.
After you've determined your product's biggest competitor, determine that competitor's biggest strength. To reach the largest market, you generally want to attack at the biggest competitor and the biggest strength. Find the weakness within that strength and position your product to exploit that weakness.
Answering this question is much like answering the third question, "What is [your] product's biggest weakness?" You can identify your the competitor's biggest strength by considering both the perceptions of their product and the business and operational impact it has on their company. Often, the competitor's biggest strength stems from their distinctive competence.