Internet Explorer version 9 (IE9) will be offically released by Microsoft on Monday, March 14. Downloads will be available starting at 12 noon Eastern Time (9:00 p.m. Pacific Time) Monday.
I've been using and testing IE9 for the past year, as Microsoft has been releasing beta copies of IE9 during its development. I have been extremely impressed with the results, and I can happily say that IE9 is a really nice browser, worthy of becoming your primary browser.
Honestly, the performance of either browser will be just fine for anyone, IMHO. It's going to come down to how you like the browser features and interface. Also, I personally like how Chrome continues to get updated frequently during the year. Microsoft releases a new browser, and then refuses to add features to it until the next major release. That's pretty annoying.
Anyway, I do recommend that even if IE9 will not be your primary (default) browser, that you download and install it when it becomes available on Monday. It's really good.