As an investor in beehiiv, and user, you know what I'm going to say, but here's what perplexity says:
Beehiiv is generally more affordable and better suited for content creators focused on newsletters and building an audience, offering features like integrated referral programs and a built-in website. ConvertKit excels in advanced automations, integrations, and selling digital products, making it ideal for creators who prioritize complex email marketing strategies and selling courses or coaching services.