Garp consistently makes chapters, gets hype, has everyone paying attention to him.
Sengoku is the same guy who lost two ships to Jack the drought, who can’t seriously injure any BB pirate, nobody ever talks about.
He gets mentioned alongside Garp like Linlin did with Kaido. They’re far from equals, it takes one look at the treatment Oda gives Garp vs Sengoku to see that.