I have both Chrome and FF installed and I just use both all the time, they're practically the same now that Chrome has add-ons; but Chrome works better with Google services like Wave, so I use it mainly for that.
I have chrome safari and firefox. I must say Firefox shits on all of them. I love all the add ons, especially firefox personas which let me customize it to be pulp fiction themed.
Chrome seems faster than Firefox, but I've been using Firefox for ages and I use a few add-ons as well. Safari isn't bad either. I just feel dirty when using IEX.