I disagree, I think 3G is fast enough for most internet applications, maybe a few exceptions like HQ YouTube videos, downloading huge files, etc. Most other applications like Pandora, Navigation, browsing the internet, finding information are all fine with 3G speeds. I find that with this applications, there is little if any difference with wifi.
On the other hand, games like Pocket Legends would benefit from wifi's quicker latency times.
4G speeds is over hyped, most of the time you won't notice the difference and 4G draws a lot more juice from the batteries. I can honestly say that I use 4G less than 1% of the time. Go figure.
As for the OP, if he truly can't get decent 3G coverage where he's at, then I don't blame him switching carriers.
Peace!