Doesn't matter which one is better, it's down to your own personal preference.
For example; what add-ons you need, whether they're compatible with the sites you visit often, is it stable on your system etc.
There's no right or wrong answer when it comes to choosing a web browser, so trial run both for a week.
Modern browser use more memory, but that doesn't mean they're bad.
I am a Chrome user, but I also use IE9 once in a while.