Ok, I'd planned to do some nice photos of me demonstrating how I could fix any of the three tuners I mentioned above on to my headless Shuker bass. Well, it would have been pointless. The planet waves mini sadly had nothing to attach to despite it's ratchet locking clip.Very secure on my other instruments though! Next up, the Snark. The biggest sized jaws on it's clip of all three. I could sort of get it to hang on to the nut clamp, but fell off easily. Both the Snark and the Korg Pitchclip could easily be clipped on to one oftye control knobs and actually functioned properly picking up the instruments vibrations. However they would no doubt be in the way of operations.
So to sum up, on my headless bass at least, none of the three offer a permanent solution. On my headed basses, the Planet Waves is great as it is so small. I think is some rare cases an odd shape headstock could cause viewing angle problems as you only have an up and down axis on which the clamp pivots. That leaves the Korg with it's flip out display and the ability to be moved about using the clamp. Probably the most flexible for other instruments but at the same time being as inconspicuous as possible. If it's functionality you require, the Snark tuner has a built in microphone as well as the ability to pick up instrument vibrations AND a metronome on board to with a 'tap tempo' button.
Three brilliant tuners each with their own strengths.... And weaknesses.