Well...nothing is so black and white. Some things react differently in different situations.
However...it is most likely you'd be using both of these as bases, and as such, KOH - potassium hydroxide - is likely slightly more reactive than NaOH.
This is by comparison of their pKa values alone, and many things may factor into reactivity.
If anything, they're both very similar in the grand scheme of things.
K; Potassium
Potassium is more reactive than sodium
Potassium hydroxide may be used as a drain cleaner but sodium hydroxide is more common.
Fr; Francium
sodium, calcium, magnesium, aluminium, zinc, iron, tin and led are metals more reactive than hydrogen.
K; Potassium
Potassium is more reactive than sodium
Potassium
Potassium hydroxide may be used as a drain cleaner but sodium hydroxide is more common.
CaO is not expected to react with sodium hydroxide because sodium is more reactive than calcium.
There are sodium hydroxide, strontium hydroxide, magnesium hydroxide, potassium hydroxide, calcium hydroxide and more.
Sodium
Fr; Francium
sodium, calcium, magnesium, aluminium, zinc, iron, tin and led are metals more reactive than hydrogen.
It depends on the lab, but sodium bicarbonate, borax, sodium carbonate and sodium hydroxide (or their potassium equivalents) are popular alkalis with many uses.
There is not a lot of difference. They are both powerful bases but potassium hydroxide is more expensive. Sodium hydroxide is manufacture by electrolysis of seawater. Potassium Hydroxide just does not have a cheap source of raw material as seawater!
aluminum will produce tiny bubbles