Other than touch events, is there any appreciable difference between testing a responsive design by resizing a desktop browser and testing it on a mobile device? There are a plethora of mobile devices that could be potentially tested and I'm trying to weigh cost vs. benefit. How do others go about testing for mobile?

Edit: To be clear, I'm talking about a mobile website or web app, not a native mobile app. Also, is there a list or a website has mobile browser differences? The best I could find Quirksmode, which actually has quite a lot of good info on it, though some of it is older:

* A tale of two viewports [1](http://www.quirksmode.org/mobile/viewports.html), [2](http://www.quirksmode.org/mobile/viewports2.html)
* [The Great WebKit Comparison Table](http://www.quirksmode.org/webkit_mobile.html)