Guys, I have installed the latest version of both the browsers as a developer my comparison are tabled below. This is what I have experienced and doesn't base on any statics: IE 9 FF4 JS running time IE is definitely better than earlier IE's FF is much faster than any browser I am using right now (which includes Safari 5, chrome 10) and is comparable to chrome 10 on win 7. Look and Feel IE looks much better and lesser cluttered FF doesn't look bad Toolbar usage buttons like refresh and Go etc... IE embeds them in the address bar and I find it quite confusing and harder to use (you can customize and move refresh button to the front of address bar but for me result was no different in usage) FF doesn't Change from previous versions Notifications (Save a file. block script etc.) Notification bar pops up from the bottom of the page which takes time to get used too FF doesn't Change from previous versions Address Bar Provides united Addr...
My Opinion.