A quick visual demonstration of my conflict between these two great browsers.
The text is rendered very differently, as is the blue of the title. Safari's rendering is more pleasing to me, maybe you disagree. But I doubt you'll disagree with the fact that these comparisons very much place favor on Safari:
FireFox's efforts are first, with Safari's second.
Safari clearly has the superior image rendering. But there's my major problem. FireFox is more reliable and seems to like Flash better than Safari does.
Looks like I'll have to use both.