I’ve been a big fan of Safari for a while; generally it’s my browser of choice in my free time. But for work, I never found it came close to the quality of Chrome, almost entirely due to its poor web inspector.
With Safari 7 out the door as part of OS X 10.9, things are very different. Safari took a huge step forward with their inspector; it’s the first that I’ve used for more than a few minutes without immediately closing the page in question and switching to Chrome Dev Tools. This post details all the changes, the most notable being CodeMirror, an all in one solution for making permanent CSS and JS edits right in Safari. Cool.