Would someone be kind enough to update me on the status of mining performance using Windows vs. Linux tools?

I've read recently that some Windows GUI miners now include the BFI_INT optimization that used to be what put the Linux miners ahead in performance.  Is that the only consideration?  I like the idea of a GUI for ease of use, but I'm no stranger to the Linux prompt, so I'll use whatever gets the best performance.  If, however, performance is about the same on both, I'd prefer a GUI.
Thanks in advance for your suggestions!