The post’s title has more the sense of Ali vs Foreman than of Coke vs Pepsi. True, both are contests, but the the latter is a selection — the former is a fight. This post is about a major problem some posts created using the Classic Editor have when displayed in the WordPress Reader.
Specifically, breaks between paragraphs are lost. In some cases an entire post becomes one long paragraph. The only breaks come from the various HTML block elements that force paragraph breaks. (Things like horizontal rules, large images, or tables.)
Here I’ll explain what’s going on and how to get your paragraphs back.