Ah, yes, I've seen that concept mentioned a little bit with regards to stepmania and arrow skins. I would say that bars are actually worse for 'negative reading' for dense non-LN patterns. 'Negative reading' works best with something that is roughly as tall as it is wide.
Another consideration for bars is that some bar skins are pretty chunky, while others can be quite small. For example, my skin has column widths of about 28, whereas I've seen other bar skins with much taller bars and much wider columns. This greatly affects how the skin feels to read, even though they are both technically bar skins.
Ultimately, the choice of skin is up to the individual player.