Well, I have most of those mentioned except a bench Peterson. I have done quite a bit of comparison. The Korg PitchBlack Stomp box is very accurate and rugged and the "dialing -in " display is very friendly. It would be my on-stage choice- very rugged and easy to see at your feet! At first I was disappointed by the lack of a swivel on the new TC Polytune, but it has been on my S2SC for a couple of weeks and it, too is a nice piece- it is a rugged little beggar; again, a friendly dial-in. I keep the Turbo-Tuner for bench work because I found it to be so sensitive that it is best for setups. It equals the bench Petersons I compared it with and Peterson's Strobo-Clip is close to both but I don't find the dial-in to be as predictable and smooth and I wish it were black- the silver is distracting in appearance, but overall the design is "elegant." I bought half a dozen Snarks somewhere and edited out 3- the 3 I use are dead on and I like how easily it hides- I use mine ( all brands of clips) set to the back of the headstock.
For a wide range of instruments and accuracy, go with Turbo-Tuner-it is clearly the most versatile, if you want one (1) premium "do-all" unit.
Finally, the old "granddaddy," Intellitouch," hangs in there- it is still going after 8 years or so. They aren't quite as refined as newer designs, but they are reasonably accurate and rugged.
