Let me start by asking that no one get into a debate about wether to capo mandolin (or any other instrument) is bad, good, indifferent, or otherwise; there are plenty of threads to that effect already, all of which get a bit too scwably for my tastes. Suffice it to say, I'm interested in a capo to play open chords that are physically impossible to play in a closed position.
So, now on to the actual question at hand: what's the best multi-instrument capo you all have come across? I'm looking for a versatile capo that would work on guitar, the mandolin family, and 4 string banjo. Are there any that can work sufficiently for all of that, or should I just look into getting a couple discrete ones?