I'll wait until Wano is over before determining where I'd place it.
Between Dressrosa and WCI, I prefer WCI, at least as a reading experience. There were fewer new characters constantly being introduced, that I could at least focus in on the ones firmly established. The Straw Hats there did not feel drowned out by everything else happening, and a lot of them got some great moments. I was also more invested in Sanji's family drama and how it would effect his ties to the crew. Katakuri was an amazing antagonist and opponent for Luffy, and Nami really stepped in to a leadership role when things looked their bleakest. For Dressrosa, Kyros is good, and Rebecca had potential, but they just didn't catch my interest as much. But I do love the Grand Fleet, and feel they were an awesome edition to the series.
Wedding Cake chase and Birdcage were questionable climax gimmicks, but I could get behind the former more because it at least tested the ingenuity of the Straw Hats being chased. Birdcage was a bad case of artificial tension because Doffy's crew was horribly outmatched by the heroes, so the surplus manpower needed something to do, even if it was pretty pointless.