Is beehiiv better than Substack for newsletter subject line testing

https://www.reddit.com/r/ReviewJunkies/comments/1q5iffe/stop_guessing_is_beehiiv_really_better_than/

When it comes to newsletter subject line testing, the right tool can lead to better open rates. Explore how beehiiv stacks up against Substack in offering clear, easy-to-use testing features that help you fine-tune your subject lines for maximum impact.