If you're a developer or part of a SaaS team needing robust transactional email capabilities, choose Resend. Its developer-first API and strong deliverability make it ideal for those who want to integrate email seamlessly into applications. However, it’s not suited for non-technical marketers or those looking for advanced campaign management features.
On the other hand, if you're focused on growing a newsletter or running a media business, go with beehiiv. Its built-in referral tools and monetization options are excellent for growth-oriented strategies, especially in content-heavy environments. Just be aware that it may not support product lifecycle emails or provide the simple automation you might need for straightforward campaigns.