For general users and developers looking for a robust and versatile assistant, choose ChatGPT. Its comprehensive feature set—including chat, image generation, and file analysis—makes it suitable for a wide range of tasks. However, if you're sensitive to costs or are building an application that requires an API, the pricing and ecosystem could get confusing with its multiple tiers.
On the other hand, if cost is your primary concern and you are comfortable with self-hosting, opt for DeepSeek. It offers open-weight models at a low cost, making it ideal for teams focused on budget constraints or development flexibility. However, be cautious if your organization has strict data residency requirements or if you need a more polished consumer experience, as DeepSeek lacks some of the feature-rich polish found in ChatGPT.