Honestly, I haven't done that much research. I've mainly been comparing low end response and dB sensitivity.
According to what I found, the Eminence have a higher sensitivity whereas the Celestions have a much better low end response.
My cab is a 25th anniversary Marshall. A pig to move about, but nice and sturdy all the same!
Thanks for your responses guys, having studied acoustics, I should probably be thinking about everything you've said already.(*Facepalm*) My only defense is that it was three years ago I graduated...