Rurouni Kenshin: Meiji Kenkaku Romantan, Hunter x Hunter (2011) Recommendations
i think those two anime are alike because they both have a deep meaningful plot. overall art, story , and the imagination-world are all necessary to define a well value anime. this recommendation isn't based on just a fanboy expressions but a well belief of knowing what is great.
As Rurouni Kenshin, the duels in Hunter x Hunter are more based in Strategy and in the psychological state of the fighters than in special powers. Also, the majority of the cast in both anime are morally ambiguous characters. Lastly, both have great arcs, Yorkshin in Hunter x Hunter and Kyoto in Rurouni, that focus in a bunch of charismatic bandits that the viewer will surprisingly support and love.
It's very enjoyable to watch Rurouni Kenshin if you have already watched Hunter X Hunter. There is a lot of similarities between these two top tier pieces of battle shounen genre, like the construction of the impact in the major scenes, the way with which the anime induces you to empathize with the characters, and the constant explanations of special powers.