I saw your post today. I am a fanatic about wearing mirrors and I strongly prefer an eyeglass mirror because you don’t lose sight if you stand up to climb, and I think it is easier to spot, especially in emergency circumstances. BTW, I wear eyeglasses anyways.
That being said, if you decide to wear goggles for winter riding, placement of an eyeglass mirror can be problematic. if you are interested, see a recent post of mine about how I solved the problem.