How to counter Cho'Gath
Let us take a look on how to beat Cho'Gath. We will look at champions who are strong against Cho'Gath and who are weak against Cho'Gath. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Adc champion who counters Cho'Gath. You can already win in champion select with the right counters for Cho'Gath. If you want to know how to counter Cho'Gath then you need to take into account the best picks vs Cho'Gath and the worst picks vs Cho'Gath. This Cho'Gath counter data is based on matches played by Pros on patch 14.23 and previous ones. It is important to see whether Pros counter picked Cho'Gath or whether they played as Cho'Gath.
Champions used by Pros to counter pick Cho'Gath
Looking at the matches from Pros (see table Pros counter picked Cho'Gath) we can see that they picked 
Varus most often to counter pick Cho'Gath. The matchup Varus vs Cho'Gath occured 2 times. Cho'Gath has 0 wins and 2 losses in this matchup. Learn how to counter pick Varus to get another perspective on the data.
Lane outcome for Cho'Gath
When looking at Cho'Gath counters you will notice that win rates alone are not conclusional. Therefore we provide an overview (see table Lane Outcome) where you can see the lane outcome of Pros who played Cho'Gath. The lane outcome of Cho'Gath consists of three outcomes: Win, Loss or Draw. Let's take a look of Cho'Gath lane and match outcome for specific matchups. Considering the lane outcome and the match outcome of a specific matchup, might enable you to find the right counter for Cho'Gath.
Conclusion
Analyze the available data and learn how to beat Cho'Gath. To master Cho'Gath take also a look on Cho'Gath builds and runes for Cho'Gath. Good luck, Summoner!