I liked Faiz's world the most. It pretty much summarizes everything that happens in Faiz with a high school setting without a lot of characters in the actual Faiz that had little importance such as Keitaro, Smart Lady, etc. Kaito was literally like Kusaka as they both were anti-hero Kamen Riders who wanted to join the Lucky Clover yet only planned on betraying them. Hibiki's world was also pretty good; it also made me wish that the AR Hibiki was the REAL Hibiki that aired in 2005. Like seriously, the character development in the AR Hibiki's world was much better over the entire series of the actual Hibiki in my opinion.
My least favorite world is Kiva; we hardly saw any action with the kid Wataru and the world was just boring. Ryuki's world was also kind of lame, but the nice thing I liked was
that the whole Time Vent thing to go back in time to prove Natsumi's innocence with nobody remembering what happened in the AR Ryuki world is exactly similar to that of Ryuki's actual ending in which Kanzaki Shiro decided to use the Time Vent to end the Rider War by keeping Yuri dead and erasing the memories of the riders that participated in the war; nice reference and tribute to that of the actual Ryuki.
Also, if we're not comparing just Rider Worlds, I'd say I really liked Shinkenger's world because it was the first time Kamen Rider and Super Sentai met. The clash between Takeru and Tsukasa was interesting, and the whole Gedou Rider thing was also very neat. Heck, they could've made a movie with Decade and Shinkenger.