I was just want to know which iPad is better because I really want to get a fast, quick working. I heard that Wifi one is much faster than the 3G one. I just want to confirm.

There's no difference in performance. The only differences between the two models are that the 3G model has access to the cellular network for wider coverage without having to tether, and it also has a true GPS receiver..

Anyway, thanks for your help.