which pk do you think is better and more efficient pk 13/14 from canna or 9/18 shotgun thank you

Without initial levels of each that you already provide, it's impossible to answer. Fertilizer comes in different proportions, so it's a matter of what fits best with what you currently use to get the ratios and overal concentration of nutes you desire. If it's soil, there's a ton of unknown variables you need to account for, too.

13/14............18 is too much potassium.