I have read that many iOS exploits target the Safari browser. Would using another browser on my iOS device be safer? Does Safari being a system app give it more access to the OS than a third party browser that I install through the App Store?
Basically not, since all 3rd party browsers on iOS use the webkit engine.
A simple way to demonstrate that is with CSS stylesheets, any browser specific attributes such as
-moz won't be rendered on the Firefox iOs app. Only the non vendor-specific css or webkit attributes.
Therefore all potential vulnerabilities webkit has, apply to all browsers inside the iOs ecosystem.