A comprehensive overview of all the iOS ad blockers. Some might have not been approved on the App Store yet.
You can select which one to use on iOS 9 by going to Settings > Safari > Content Blockers.
Key differentiators to watch out for are simplicity (Crystal has no settings) vs configurability (1Blockers has many options and allows you to create your own blockers) and price.
You can follow this Silk and receive notifications when new ad blockers are added.