Which is more accurate Browserstack or F12

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I am getting different results when looking at ie8 in Browserstack and the F12 developer tools in ie11. Which would be a more accurate representation and why?

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PoeHaH On

A native browser is always better than the simulated result via the developers tools. I would trust IE8 in Browserstack more than IE11 dev tools.

One example why:

It is worth noting that IE 9 shipped with a newer JavaScript engine, called Chakra. While the browser itself supports a number of compatibility modes, because the JavaScript engine itself differs significantly from what shipped with IE 6, 7 and 8, there are acknowledged differences between the experience in IE 9 and testing in a standalone browser.

As found in this article:

http://www.smashingmagazine.com/2011/09/02/reliable-cross-browser-testing-part-1-internet-explorer/