The greatest champs out of lane to counter Warwick include Kalista, Lucian, and Samira. These picks are all great at countering Warwick with win rates over 58%. Even if these Warwick counter picks are not chosen in the same position as you, it's not a good idea to play him into any of these matchups. They will often destroy Warwick.
Conversely, if the opposing team choses either Karthus or Trundle, Warwick mains should strongly consider taking him, as he easily destroys these champs with win rates over 53% against both ofthem.