Chrome for the win.
IE is .... well, it's IE. Yes I'll admit that through 7, 8 and 9, it is getting "better" but nothing compared to today's Chrome. They will never be ahead of Chrome and Firefox because all they do is copy every else's features.
Firefox used to be the best a couple years ago when it was actually light and fast. Now it's become what it was trying to replace: bloated and heavy.
Chrome is always quick, snappy and VERY easy to maneuver around in (referring to shortcuts, half of them being done with the mouse).
I am guessing Splash has very specific extensions/capability needs, because the Chrome Market has a ton of stuff now.
My favorite part of Chrome: Synchronizing my bookmarks.
Whenever I set up a new computer or reinstall Windows or any reason for me to install Chrome somewhere, I just log in with my gmail account, count to 5 and bam, my themes, bookmarks and extensions automatically get installed and my newly installed Chrome looks just like the one I've been using at home for 2 years.