Most people will tell you no way, I say try them both and see which you like best. IE has improved a lot with Version 8, its all down to personal preference though.
I have IE 8, FireFox 3 and Google Chrome installed, although I use IE 95% of the time.
Each browser has its pros and cons.
I think IE is fast, looks nice and generally gets the job done although it’s the cool thing on the internet to hate it. Never really found a good reason to switch.
I’ve always found Firefox to be quite slow and looks pretty horrible in its default state, although it can be skinned to look pretty nice and has a massive library of plug-in’s.
Google chrome is something new, its the fastest of the three and very minimal. I find its perfect for netbooks, the currently stable version lacks support for FTP downloads, you can’t press the scroll wheel down and scroll through webpages and there’s no support for plugins. Most of these problems will be fixed in the next version so that will be interesting to see.