I like TextExpander too, but I don't like it's search and insert interface whereas I like Alfred's much better. Also, all snippets are stored as files so you can add to it by simply placing a file in your snippets folder without using Alfred. Also, it's easy to copy the contents of a file from the command line and pass it elsewhere if you'd like, again without Alfred. And finally, I'm keeping all my GitHub Gists in there as well.