i dont use both i use opera but the probelem with opera is that it doesnt support toolbars but other things are ood in opera chrome & firefox are also good for me.
I prefer chrome because is much more simple and its more fast loading the pages, and loading the videos. Don't know why it loads videos faster (from youtube for e.g) but for me works.
Chrome is better for me because is much more simple and its more fast loading the pages, suggest spelling, site and loading the videos and much more.......