If you are a developer looking for an efficient way to handle transactional emails, especially in a SaaS application, choose Resend. Its API is tailored for developers, providing a robust SDK and excellent deliverability, making it ideal for technical implementations. However, if you're a marketer or require advanced campaign management tools, this isn’t the right fit.
For solo creators or small businesses focused on social media, Buffer is the better option. Its user-friendly interface allows for easy scheduling across major social networks, and the freemium model is a great way to start. Just be aware that if you need advanced analytics or are managing many channels, you might find Buffer's features limiting and costly as you scale.