• It has a nice interface for searching history - nicer than the history search included with the shells I've used
• It has a "workspace" mode - it remembers which directory commands were run in, which gives you the option to limit history search to commands run in the same directory, which are often most relevant to the project you're working on in that directory
• If you want you can back up, or sync history to multiple machines. I know I've been in situations where I know the command I want is in history, but it's in history on my desktop, and I'm on my laptop at the moment

Bash by default limits history to ~1000 items iirc, and doesn't store anything but the command itself