IE is a better products. Firefox is free and that mean that it is not as good ,. because you have to Pay for IE it means better products. More expansive = better products, my favourite web browser is Lynx http://lynx.isc.org/
IMO, IE is for normal internet surfers and FF is for web developers due to tons of web developing addons. Most of the site stats report can show the answer. Of course, IE takes more RAM than FF . But I find Maxthon browser(IE core) takes little RAM and resources and runs fast . I had a thread comparing FF and maxthon browser . If you are interested, pls visit http://forums.digitalpoint.com/showthread.php?t=1117419 I really hope FF could takes as less resource and run as fast as maxthon browser .
There's a stark contrast between the higher speed FF and IE. That's why I'm still using FF until today.
i love using firefox because of many plugins i can install to it.. plus the pages load faster that IE..
Since I switched to FF I have never gone back. My only problem with FF is when doing stuff with CSS, FF doesnt seem to do what you tell it to.