Definitely the 4G. The extra screen real estate is nice. Puts videos in the correct widescreen aspect ratio, and apps are updating to take advantage of the extra space. It's lighter and slimmer than the 4S if that matters to you, and its definitely the best looking phone they've put out so far, if that matters. The operating system is pretty much what you're used to with a few updates and tweaks. Apples new charging port is both a blessing and a curse. It's non directional so it's easier to connect, it's what allows the phone to be slimmer, there's less of a gaping hole in the bottom of the phone, and this will be the standard the rest of the apple devices are going to. The bad thing is you're phone charger doesn't work with any of your other existing apple devices, but there are adapters available. Personally, I think its a net gain. I like it. That's about as good as I can lay it out for ya. Lol.