This is a short answer. Hydrofiber isn’t treated as a type of dressing of its own. Hydrofiber dressings are a variant of hydrocolloid dressings.
So the details about hydrocolloids are where the answer sits. Hydrocolloids are made of cross-linked, water-attracting materials containing cellulose, gelatin, or pectin. They come as sheets, paste or powder. At first they keep water out, but they slowly absorb water, letting more through and forming a gel. They lower wound pH, which slows the growth of bacteria, and they can be placed across joints or used to fill wound cavities.
Where they are used: pressure wounds, and wounds with minimal to moderate drainage, changed every two to four days. Where they are not: they should not be used on necrotic (dead tissue) or infected wounds. The practical drawback is that you can’t see the wound through the dressing while it is in place.
What this page can’t do is tell you how a particular hydrofiber product differs from a hydrocolloid sheet in practice. Making up a difference here would be guessing.
As with every type of dressing, whether this one suits a wound depends on how much fluid the wound produces and whether it is infected or contains dead tissue — judgments made by examining it.