It honestly makes no sense to have the Ultimate Choice in a Miscellaneous sub-category, especially since it's the only thing in said sub-category. It's just another button to press, and is simply illogical, is there any real reason for it to be like this? Because if there isn't (and I really can't think of anything, since it;t the only thing in Miscellaneous) could change it to it's own category?
The only reason I can think of, is that other run categories could be added in the future, such as all giant puzzle pieces, etc. But I still think that it doesn't make sense for now and should just be a category rather than misc.
Because the runs in comparison to other categories are very short, and in past kirby games, Arena type runs has always been marked as Miscellaneous.
Speedruns involve beating the game The Ultimate Choice is not beating the game, it's just a game mode, therefore it's miscellaneous
As mentioned by Demolition14 previously, and more recently by Primal-Spire, the Arena has always been Misc. in all the other Kirby games.
Also it doesn’t really matter if it is, if you want your time to be automatically shown when someone goes on your profile, their is an option in your profile settings that shows you Misc. runs by default (second option to the bottom of General).