iPhone. There isn't another phone on the market that is such a pleasure to use as the iPhone. 3G speeds are great on it, works on EDGE too, aswell as wifi. Consistently, 3G has proved to be 2.8 times faster at loading than EDGE, and most of the time, isn't far off wifi speeds.
The inbuilt Safari browser is a joy to use, truly fantastic.
Better still are the ammount of site specifically ported for use on the iPhone and iTouch. Google for one, along with Gmail, Facebook, ebay and many others have specially designed "iPhone" views to use with the iPhone and iTouch to make browsing look and geel better, load faster and be more efficient.
The same thing will happen with the iPhone that happened with the iPod. The iPod revolutionised the portable MP3 player market, and as such, 3rd party manufacturer support, such as headunits, are geared for ipods. Same will happen with net apps with the iPhone.