This post was a pretty lousy one, seeing as you failed to say any reasons as to why that's so. Anyways, I think Cofagrigus is better anyways. Dusclops has 0 offensive presence and is forced to go with Night Shade for damage, while Cofagrigus isn't as poor in that regard since it has a decent 90 SpAtk, and access to boosting moves like Calm Mind. Cofagrigus can also run an item as Dusclops is pretty much forced to go with Eviolite, giving it many more options such as Mental Herb to dodge Taunt, Lum Berry to block status, going with a ChestoRest set, etc. Also, Mummy's great considering how many pokemon rely on their abilities to do well, such as Scizor, Blaziken, Excadrill, etc.