The greatest champs out of lane to counter Fiddlesticks include Kalista, Samira, and Draven. These picks are all good at countering Fiddlesticks with win rates over 54%. Even if these Fiddlesticks counter picks are not used in your lane, it's not smart to choose him into these matchups. They will usually crush Fiddlesticks.
Yet, if the opposite team brings either Galio or Tahm Kench, Fiddlesticks mains should strongly think about taking him, as he easily beats these champs with win rates over 55% against both ofthem.