The different character sets make it impossible to say what this would mean. My limited code golf experience is that most often BQN solutions use fewer characte

The different character sets make it impossible to say what this would mean. My limited code golf experience is that most often BQN solutions use fewer characters than K ones, but BQN has 63 primitive glyphs to K's 25 or so (depending on version). I do think K design values using its limited resources to enable terse code more than BQN, but if screen space is what you care about then BQN will tend to use less of it.