Samurai Troopers is clearly the shounen version of Sailor Moon, as they go hand-in-hand for their story, characters, development, and overall style.
Both are classic, must watch, old school anime with an identical plot: group of 5 teenagers fights against the monsters of an evil empire that wants to conquer the Earth. The above said kids have magical super powers (related to virtues in Samurai Troopers & to planets in Sailor Moon) that make them transform respectively in armored samurai and sailor scouts (the transformation scenes are extremely similar). Both of the group leaders (Ryo/Usagi) even have a feline pet/helper (White Blaze/Luna).
Sailor Moon, being a shoujo, has plenty of romance, drama, comedy, and also a better character development, while Samurai Troopers is more focused on action.