Jeff Richardson of iPhoneJD.com posts Why lawyers will love the iPhone 6 and iPhone 6 Plus.
Jeff Taylor of DroidLawyer.com posts Android Lawyers Won’t Love the iPhone 6 and iPhone 6 Plus.
They each posted respectful comments on each other's posts. So both camps can be happy with their respective phones.
Personally I am excited about the iPhone 6 because I skipped the 5 and have been increasingly impatient with my iPhone 4S this year.
If you are unsure which to choose between the iPhone 6 and 6 Plus, one aid is to go to WonderHowTo's downloadable PDF iPhone 6 cutout file and print it out on your printer to see exactly how big the 6 Plus is.
Everyone seems to agree that the camera has huge improvements. See Wired Magazine- The iPhone 6′s New Camera Could Forever Change Filmmaking. If that is important to you, you may want to consider paying extra for the 128 GB version so you won't be limited with your home movies (or witness statements.) One omission from the Wired article is the 6 Plus has DSLR-like optical image stabilization while it is "just" electronic for the 6. C|NET Personally I'm still leaning to the 6 because the 6 Plus seems a bit too big for pants pockets.
Upgrading from the 4S to 6 adds a ton of features, including the ability to sync with next year's Apple Watch. Upgrading from the 5S to the 6 is a much closer call. Here's a handy comparison chart. The 5 series will work with the Apple Watch.