usually experiance is best but I'll list a couple features.
Built in Pop-up Blocker default=on
Tabbed browsing...never need to open a new window again (unless you want to) and links open in the backround.
google search toolbar to your right...(also can be used for several other search engines)
Live bookmarks (RSS+bookmarks=awesome)
Many Many Many extensions that add power if you want.
windows binary only 4.7 megabytes
not integrated with your operating system + good design = less security problems
spyware begone
loads text before images (makes it somwhat faster)
So in general alot of us find it "better" then IE....I personally have not used IE in years so I would not know (linux user)
edit: oh and don't forget
pornzilla says it's the best browser for porn!