Not sure if trolling or clueless.
On the off chance you are clueless, Apple doesn't permit competing browsers in their app store. They sneakily did this by banning all interpreted code (for 'security reasons'). That means no JavaScript. And a browser is mostly useless on the modern internet without JavaScript.
So, the only thing you can do with a browser on iOS is to wrap Safari in a skin. But, surprise, Apple screws you there, too, because they give you a slower engine in that mode. So, every single browser on iOS is just a Safari skin and they all run slower than Safari. Hurray for Apple's walled garden.
There is one exception in the app store, and that's Opera Mini. To get around this rule, Opera has a server farm in the cloud rendering pages and JavaScript and sending the results down to the Opera Mini clients. It's inefficient and doesn't work as well as a native browser, but it's the only way to "compete" with Apple. Oh yeah, and the whole Opera Mini client is designed for dumb phones that lack the power to run a real browser.