I have a Mansom Supreme (they make other anchors so I a not certain that this is the one you are referring to) and have been very pleased with it. On the other hand, one big advantage of the Fortress is lightness, including the fact that they do not recommend a great deal of chain be used with their anchors. They are good anchors and the light weight is a consideration.
If you plan to use an anchor roller make sure that the anchor you want to use will fit nicely on it. One advantage of CQRs and Bruces is that they fit on rollers well. With some of the others you have to experiment to see.
In South Africa doing lots of boat stuff. Departure north from Cape Town around December 15th. Arrival in the Caribbean around the beginning of February, after 5300 miles or so.