My experience with FF has been that it is quicker than IE, but my experience is limited.
When I'm on the road using dial up, I exclusively use FF because it seems to load the text first and then the images. To me, on the road with dial up, the images are the least important, and I hate waiting for them in order to read the text further down the page.
I use IE at home with my broadband because it is faster(to me), and I'm more familiar with it...
...but on the road with dial up...
FF is the way to go.
