Socket said:
High bars are closer to your eyes, so there's better response time with steering due to less lag distance.
Only if you shorten your arms to suit. Or you could increase your nerve voltage by drinking battery acid, to give a stronger signal that's less susceptible to interference.
Umm, apart from that, just play around and find the best one. High isn't always good, and doesn't always make things easier to lift, so just try different combinations so you get the best comfort vs handling for your style of riding.