The top picks globally to counter Физз include Люциан, Самира, and Афелий. These champs are all good at countering Физз with win rates over 54%. Even if these Физз counter picks are not played opposite your position, it's not a good idea to play him into any of these matchups. They will usually destroy Физз.
Yet, if the opposite team choses either Галио or Скарнер, you should strongly consider taking him, as he easily destroys these champions with win rates over 54% against each ofthem.