When deciding between a patent and defensive publication, it's important to consider the legal complexities involved. Patents offer strong protection but can be costly and time-consuming, while defensive publications are quicker and cheaper but offer less protection. One uncommon complexity to keep in mind is the risk of patent trolls targeting your patent, which can lead to costly legal battles. On the other hand, defensive publications may not provide as much protection against infringement. It's crucial to weigh the pros and cons carefully and consult with a legal expert to make the best decision for your startup.