The iPad responds exactly when you touch it, and exactly where you touched it. I have to second guess my Galaxy Tab every single time, as well as wait for it to have a cup of tea before it decides to respond or not. It's the exact same issue I have with all Android touchscreen stuff, their screen and tech just simply isn't a patch on Apple, regardless of how much more you can theoretically do with it.
That said, pop into a shop and try them both out, you may find the trade-off in price worth it. I'm probably going to flog my Galaxy Tab cheap soon anyway because I can't be doing with it any more.