Concerning the material/coating named Tuff-Ex, it is the special surface of the latest knives by Cold Steel. This company previously used Teflon for its knives, but replaced it with Tuff-Ex because it provided better resistance, durability, and overall improved the knife's properties and performance under company testing conditions.
However, the key question remains for the average typical customer, whether one needs such a knife? Tuff-Ex is essentially designed to primarily function as a lubricant for tactical knives, facilitating the penetration of the blade into an opponent's/enemy's body. In short, the knife penetrates more easily and effectively upon contact with fluids. It is also great that thanks to such materials, the blade is practically maintenance-free (as long as it is present, of course).
Though it is more ideal for soldiers, hunters, and similar types of people, it can certainly also be used as a universal work knife for the forest, nature, chopping, and rough handling, as it is perfect for this hardcore type of work. On the other hand, it is a cold shine without soul and history (like a compound bow against a traditional one), which a "bowie" might offer you.
It is also worth remembering that such a layer can be worn off or scratched quite quickly on hard surfaces, not to mention that most tactical knives do not usually have sufficiently wide blades for comfortable woodwork. These are various primarily stabbing variations and clones, hence requiring even more careful selection…