Where I live, 3G has minorly more latency and 2MBit down.  And the only reason it isn't 7Mbit down (as fast as my home connection) is because I have an iphone 3G vs a 3GS.  Alot of the 3G browsing slowness is from the smartphone web browser being slow vs. the actual connection itself.  It's alot more zippy for me to browse the web tethering to my laptop than it is on my phone.