I know it runs fine, but from looking at (on other forums) peoples comments regarding "whats best, Eagle vs xxxxx" the main factor seems to be that Eagle runs native, regardless of if the others run also under emulation.
If you are locked in commercially then you tend to run whatever OS the app was designed for, so if the app you require is native Linux then you run Linux rather than CYGWin etc, 90% is Windows native, as well as the obligatory (seemingly) Microsoft Office. I have a Linux machine with Libre (Open) office on and I get on just fine but I also have 2 Windows machines one for PCB design and one for software development.
For hobbyists however, sometimes people disregard software purely because it was built for Windows, I am not one of them, but I know some who do.
I was just opinionating why I think Eagle (apart from it is actually a good piece of software if you know how to set it up) tends to be the most popular (or it was a few years ago in any case).