What is the best capo to buy for an acoustic guitar?
The Keyser and Dunlop trigger type capos are well proven and reliable. They both provide the advantage in allowing for quick changes. My concern with these types is that the spring does tend to weaken and the “grip” becomes less firm thus affecting the tone. The Shubb capo with the radius’s lock lever and roller is very good although it is not as good for quick fret changes unless you practice. However, this one will outlast any of the others. The small Planet Waves capo is also very reliable but with the need to tighten the knob it is not good for quick changes. Their new Dual Action capo (a trigger type with an adjusting tension knob) is a good hybrid. I only got it recently but I have to say it’s becoming my favorite.