You really need to identify what you intend to do with your Marauder. Since any reasonably good scope will work well on it your selection will be narrowed by several factors. First, the scope will need to focus at the closest range you intend to shoot, and out to the farthest. Second, you will need to choose magnification. Fixed power scopes have the advantage in that nothing changes with respect to hold overs, while variables allow you to zoom in or out as desired. Third, if you hold over rather than click, FFP scopes may be a better choice, though they tend to be a bit more expensive. Fourth, you will select the reticle that you like. Fifth, consider the required ring height, and if will you get a good cheek weld with it. Big objective bells let in light and increase resolution, but require tall rings.
Personally, I found that for most of the casual target shooting that I do with my Marauder and Armada, the Hawke Sidwinder Tactical 10X fixed power scope with half mil-dots works quite well. A number of folks at first think the 10X is a bit much, but with practice, they soon find that it may be limiting. It is a bit much if you are shooting most game critters for which it is suited. But, if you are shooting at small targets, it might not be enough.