Switch probably has the most balanced sales of the current consoles, these are based on VGC numbers
It probably depends on what you expected a "balanced" distribution to look like. NA and Europe are much bigger markets than Japan or RW. I would expect a perfect balance to be something close to this:
NA - 35%
EU - 35%
With that in mind PS4 and Switch are selling about par in NA and RW. PS4 is selling above average in Europe and below average in Japan. Switch is the reverse, above average in Japan and below average in Europe. XB1 is totally out of whack being strong in NA, about par in RW and weak everywhere else.
Anyway, I stand by my statement. This accomplishment is impressive for Switch, because Europe is their weakest territory.