The Colonial Warden class is the second smallest vessel of the Colonial Fleet. In Void Admiral, Frigates are the smallest naval vessels. However, in reality, Corvettes should be (in my humble opinion). Patrol and Torpedo Boats are large fighters as far as I'm concerned for game purposes. As such, I swap the Frigate and Corvette designations around. So, whenever the rules speak of Frigates, I call them Corvettes, and visa-versa. As such, the Warden class is a Frigate.
In Void Admiral Corvettes are Squadron sized ships that only have 1 hit each and so aren't expected to last long without shadowing a larger vessel for support or attacking as a pack. Frigates however can take a hit or two, having 4 hits each. As such, these ships operate independently. However, it never hurts for the Captains of Warden class ships to stick close together. Safety in numbers and all, and with more targets to choose from, Warden vessels can survive a little longer in a firefight. Their unique arrow-head shape permits weapon arcs that cover both front and sides whilst lowering the radar signature of the ship.