Marui is a really tricky player because we know the Wonder Castle (I know it as perfect fortress) can't be beaten by a power based techniques, but both Chitose and Inui aren't powerful they play on tactics. Chitose was able to seal the first door of Muga against Tezuka which also seemed like an unbeatable technique.
Kaido has some of the best court coverage in the entire series and the laser-gyro combination is not easy to beat at all. Inui knows Kaido really well and therefore might have a slight advantage, but he did say that with the laser-gyro combination he is unbeatable. Inui also has the waterfall and Chitose has the kamikakushi serve (Marui can easily return this with super rising but I'm not sure about Kaido)
The deciding factor of the match will be the wonder castle. It could take a toll on Marui's stamina in which case kamikakushi comes back into the picture and data tennis could take full effect. In terms of Chitose losing to the third court, it was said that in terms of skill Chitose and Tachibanna were much better than their senpais, but they were beaten by their ability to synchro. Since Kaido and Marui are not going to synchro that is not as valid an argument.
Chitose could use Muga and imitate a technique that could beat wonder castle like the boomerang snake or the moon volley or even the wonder castle itself! (he did it with tightrope walking so it might be possible). However, in the end I would still go with Marui-Kaido just because it will take a while for Chitose and Inui to break wonder castle (if they can), but if they do Kaido's laser,gyro,boomerang, and short snake combination will allow for that push to pull through in the end.
Sorry for the length!