If you're a creator or a solo founder focused on building an engaged audience, go with Kit (ConvertKit). Its tag-based subscriber management and strong visual automation features cater specifically to your needs, making it perfect for newsletters and content-driven strategies. However, be aware that the email designs are functional rather than visually stunning, and costs can grow as your subscriber base expands.
On the other hand, if you are part of a marketing team or looking to automate workflows without any coding skills, choose AutoGPT. Its user-friendly visual builder and integration with over 45 platforms make it an excellent choice for automating tasks and streamlining operations. Just keep in mind that it might not serve you well if you require extensive offline functionality, and some advanced features may push you towards a paid plan.