Product Help

I don't really know where to post/ask this... so I'm just doing it here. I'm looking into purchasing a pocket amp (which is something you plug into your guitar that you plug headphones into, so you can play without disturbing others), and there are two I really like. They are the exact same accept one's $10 more expensive. The more expensive one has something called "Stereo Chorusing". What is it and would it be worth the extra $10?
Here are the links:

Standard: guitarcenter.com
Pro: ($10 more expensive) guitarcenter.com