Which version of Dreamweaver are you using? If it's one of the CS builds, it's one of the better editors available still.
Overall I would argue that FF is more standards compliant, but there will always be differences between IE, FF, Safari, etc. I usually like to make sure my pages work first in FF (which implies it was coded correct), and then figure out how to make it work in IE. I was pretty much told the same thing at work.
"Greatness is not a function of circumstance. Greatness, it turns out, is largely a matter of conscious choice, and discipline." - Jim Collins