Year to date - cat pics are averaging 20 likes per post on Insta and 25 likes per post on Pixelfed. Manga does well on Instagram with 28 likes per post on average; on Pixelfed? 5 likes on average.
Flowers or "Bloomscrolling" does well on Pixelfed with 25 likes per post; on Insta it's 23 likes per post.
Basically, trends in what I post show an interesting top list.