The best style of capo will depend on what you're seeking in terms of functionality. If you prioritize user-friendliness, quick application and removal, and reliability, then trigger-style, spring-loaded capos are widely popular. These capos are typically affordable and compatible with most acoustic and electric guitars.
However, if versatility is important to you, it's worth considering a capo with adjustable tension. A capo with adjustable tension allows for use across a broader range of guitars, as you can precisely adjust the pressure to suit the specific guitar you're playing. For example, a guitar with a heavier string gauge and higher action will require slightly more tension to minimize string buzz and ensure accurate intonation, compared to one with lower action and lighter strings.