Oh IE, whenever I heard your name (IE below 7), I got this shiver on my back, remembering how I have to code entirely different CSS to work with it. All for "compatibility" said my boss, oh god nobody using old IE (below 7) anymore.
Back to topic, browser are not matter of score if the differences are not significant. Not every websites displays intense flash animation or any JS/HTML5 animation. Did you comfortable with the interface ? Did it render pages properly (following latest HTML5 standard) ? Do you want some add-ons to work with it ? Was it stable ?
I tried it for some time, here are my thoughts :
1. I don't like the UI, I agree it has similarities with different browsers, but for me, it has too much gimmick bar. Oh how I love Chrome's simplicity
2. Free cloud service that stores your configuration, browsing behavior, bookmarks ? Is it trusted ? My privacy is at risk so I don't use it. Besides, chrome links your everything with your google account, so I just have to focus in a single account.
3. I can't find my chrome's plug-ins equivalent here, I need those.
4. It loads slower than Chrome; yes firefox/aurora was slower but whenever I want a quick look at some link, Chrome did that well to me. (I have a habit to open links in website, satisfied, then close the tab, close the browser. So yeah, chrome for me, despite I'm currently using SSD)
Bottom line, Chrome is the best.