Some features on the WordPress Jetpack plugin are duplicated by other plugins. However, if I need a function that’s available in Jetpack, I’ll try running that version first before installing another plugin to do the job. Why? I’ve already got Jetpack installed, so why install another plugin if it’s not necessary? If I’m not happy with the way the Jetpack version works – and sometimes I’m not – I can always go plugin hunting to see if I can find another solution.