What's the difference between iTouch 4G and iPhone 4S?

Except the calling feature, Siri, and the A5 chip for the 4S, I think both are the same, and both have the same features.Am I right?
But the design of the iTouch is way better IMO.

Please reply, I'm planning to buy the Samsung Galaxy S3, but I'm confused, so I thought if I get an iTouch, I'd also get a replica device of iPhone 4S.

You're pretty much right- the 4S will be faster, have a better camera, an A5 chip, 3G connectivity and Siri. If you just plan on listening to music, surfing over Wi-Fi and playing apps, that stuff doesn't matter.

Personally, that's what I'd do. I prefer Android over iOS by a long shot.