If you’re a developer looking to integrate transactional emails seamlessly within a SaaS application, go with Resend. Its developer-first approach and excellent SDK support will make your job easier, especially if you prefer component-based templates through React Email. However, if you lack a technical background and seek advanced marketing features or campaign management, Resend is not the right fit.
On the other hand, if you’re a solo creator or a small business needing a straightforward way to plan and schedule social media posts, Buffer is the ideal choice. Its user-friendly interface allows for easy scheduling across major platforms, and while the free plan is usable, keep in mind that analytics may not meet your needs if you require in-depth insights or if you're managing multiple accounts on a budget. In that case, consider whether the costs for additional channels align with your goals.