Flip a coin. One is a higher pH at same molarity, so it's a stronger base at 13,6 vs 11,5 at ,1M . One adds twice as much K, but the levels will be so small i doubt it is relevant to 200ppm does of typical hydro/soilless context of constant fertigation at 1,3 to 1,5 EC type concetration ranges.
Bother are very strong.. it'd be like adding HCl on the other side of scale (acid). hydrochloric asid is a 2? 1? roughly same ratio of h30:oh flipped.