Keep behind allied minions if Caitlyn is harassing you with Piltover Peacemaker (it deals less damage with each subsequent target).
You can intercept Ace in the Hole's missile from hitting an ally if you stand in its path.
The stat comparisons shown here feature several vital Vex versus Caitlyn counter stats that may help you appreciate the distinctions between this pair of champions. Vex’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Caitlyn’s KDA ratio of NaN, indicating that Vex may be more central to their team's team fighting effectiveness than Caitlyn..
Vex typically has a similar longest kill spree as their enemy does. Typically, they receives a similar amount of damage to Caitlyn. This typically indicates different amounts of tankyness; however, it can also illustrate that the champ with higher health has less mobility and thus is not able to flee from further harm when engaged or poked.
Both League champions are great. Both have their strengths, weaknesses, and counters. In League's current meta, Vex usually fairs equally well when facing off against Caitlyn, with a 50.1% win rate. Therefore, Vex makes an ok counter for Caitlyn.
While Vex does have a higher winrate compared to Caitlyn, when on opposite teams, Vex also has a much lower difficulty level that makes them a less complex champion to pick up and master. You should be careful when picking Vex into Caitlyn.
Additionally, Vex also has some amount of utility and CC, a similar amount to Caitlyn. This makes her just as valuable during teamfights, especially when facing champions with a lot of burst damage.
While there isn't one best champion in League of Legends, in Vex vs Caitlyn matchups, Vex is the better champ with a similar win rate, less champion complexity, and a similar amount of utility to help out your team members during team fights.
Vex is a decent counter for Caitlyn. You will do well by focussing your strategy on keeping up your gold and cs and taking out objectives. If you are able to do that, you should do very well as Vex against Caitlyn.
To truly master Vex in order to counter Caitlyn during both the lane and mid / late game phases of League of Legends, you should continue reading to gather a few extra lessons on this matchup. If you listen to the build and tips displayed above, you will grow your win rate significantly and be that much closer to League of Legends pro players.
Vex often accumulates a similar amount of CS compared to Caitlyn. Champions who on average don't earn many minion kills usualy don't need much CS to be valuable teammates, such as support champions. These kinds of champions are capable of scaling properly off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, typically require a lot of items to be effective. In either case, try to exceed the values shown on this page to do well.
The ideal items to have in your Vex versus Caitlyn build include Rabadon's Deathcap, Zhonya's Hourglass, and Shadowflame. When Vex used at least these three pieces in their build, they did significantly better vs. Caitlyn than with many other common item sets. In fact, Vex boasted an average winrate of 50.1% when playing against Caitlyn with this counter build.
To have the greatest probability of coming out on top against Caitlyn as Vex, you should use the Electrocute, Taste of Blood, Eyeball Collection, Ultimate Hunter, Transcendence, and Manaflow Band runes from the Domination and Sorcery rune sets. Out of all the rune builds players picked for Vex vs Caitlyn matchups, this combination of runes resulted in the best win rate. In fact, these runes gave a 50.1% win rate overall.
If you need to view Vex x Caitlyn tips and counter builds for a a specific skill level, feel free to select one from the selection menu shown above. If viewing for the first time, the stats and guides shown are computed using every game with data with these champions.