My iPhone 5 is jailbroken, but I had an 4S I was no longer using, so I loaded iOS 7 onto the 4S. After playing with it for about a day or two, I've decided that my 5 will stay on iOS 6 until iOS 7 is jailbroken, and I may not upgrade even then.
Primary reason is that I find the new UI hard to see and use, but jailbroken tweaks are also much better than iOS 7. I think NCSettings icons are more elegant looking than control center, and I like being able to pick and choose which toggles to have. Background Manager is finally maturing into a great and flexible multitasker. And I love being able to put five icons into the dock, and I also have a tweak that lets folders open up to full screen.
So overall, for me, iOS 7 doesn't come close to replacing half of all my jailbreak tweaks. It's funny, because iOS 6 had just enough new functionality that I was willing to give up jailbreak for them, but all iOS 7 seems to do so far is to try to replace jailbreak tweaks and not do as good a job at it. This might change when new apps designed for iOS 7 start arriving, But as far as the operating system itself, IMO jailbroken iOS 6 trumps iOS 7.