As acoustic guitars tend have a higher action than electric guitars, i.e. the strings sit further away from the fretboard, a capo with a strong action is required, therefore you should look at capos with a spring or trigger action rather than capo’s with strap or elastic mechanisms.
For the typical steel stringed acoustic guitars, a capo that is designed to fit nicely around a curved neck is preferred, not a flat neck like some classical guitars and sometimes electric guitars.
Amongst the most recommended capos for acoustic guitars, the Shubb and Kyser capos are amongst the highest rated.
The Shubb C-Series or S-Series are the favourite Shubb Guitar Capos with the S1 being the more recent design and the top of their line, it features stainless crafting along with a roller design to ensure the application and de-application is smooth. These are certainly built to last and most likely will be the only capo you’ll need if you find it suits your style.