If you are a developer looking to integrate transactional emails into your app, choose Resend. Its developer-first API and excellent SDK allow you to focus on building rather than getting bogged down by marketing intricacies. It's perfect for SaaS applications where you need reliable deliverability and a component-based approach with React Email templates. However, avoid it if you’re looking for advanced campaign management or need a non-technical marketing tool for broader email strategies.
Conversely, if you’re running a media or content-focused business and need to grow your newsletter audience, go for beehiiv. Its built-in growth tools and monetization options are designed to help you leverage your content effectively. The polished editor and analytics make it user-friendly for newsletter operators. However, steer clear if your main focus is product lifecycle emails or if you want a simple tool for creating automated email campaigns, as beehiiv is more geared towards media-style newsletters.