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Chrome on iOS does all rendering using the native iOS WebView. Rendering should be quite consistent with Safari (although JavaScript may be slower). Chrome differentiates by implementing their own network stack and browser "chrome" (tabs, history, favs, etc).

JS is no longer slower than Safari since 8.0, if you use a WKWebView

http://9to5mac.com/2014/06/03/ios-8-webkit-changes-finally-a...

Which Chrome doesn't do.

https://www.quora.com/Why-doesnt-the-new-Chrome-for-iOS-use-...

At least these aren't the default on any phone though, so their usage statistics should be relatively low.

The worry with Chrome for me is not that these issues happen, but that they seem to be slow in fixing them. I'd hate to find Google have pulled resource now they have a dominant position in the browser market and will languish in the way older version of IE did.