If you're a newsletter operator or running a media-focused business aiming to grow your audience, choose beehiiv. Its built-in referral tools and monetization options are tailored for those looking to scale. However, if your focus is on lifecycle emails or you need a straightforward automation tool, beehiiv isn't the right fit.
On the other hand, if you're a developer working on a SaaS application, Resend is the better option. Its developer-first API and strong deliverability features make it ideal for transactional email needs. Just keep in mind that if you're looking for a user-friendly marketing tool or need comprehensive campaign management, Resend may not meet those needs effectively.