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Pro Built-in support for Git and Subversion
Although the software doesn't ship with these libraries, it does work once you have one installed.
Pro Live Preview mode
Makes styling a site in CSS simpler.
Pro Built-in FTP client
Publishing your changes to the web server is a one-click operation. That is, one click per file, or one click for all your changed files. Or even cherry-pick the files to be published in the next batch.
Pro Many plugins available
There is a huge library of user-created plugins, ranging from additional syntax modes, to code validation and beautification, to reference materials, code snippets, text actions and more.
Coda has been developed by Panic exclusively for Mac since 2007. The experience of the developers shows in the stability and polish of their product.
The price of $99 is more than many other editors.