I feel Leela 0.9 is stronger than Zen 6 because its neural net is superior. The win percentages of the neural network seem to help a lot. Leela has got a very good intuition.
I do not feel Zens Heatmap is superior to Leelas move probabilities.
One feature of Leela I like a lot: Click in the analysis window on a line and the variation is shown with move numbers on the board. (an option to show the numbers & stones would be nice).
An further option to show the 5 best moves colored by winning percentage instead of move probability would also be good.
But Zens heatmap has a structure (different colors).
Leelas move probabilities has only 3x the same color
Everytime with a 1% difference.
And you can see that 10%
of the whole board are marked in this color
Maybe this is a bug and he doesn't know how to solve it?
The analysis window feature is great.
Zen has an option to show the numbers on the stones. Should be also made for Leela.
You last point is a MUST HAVE
But better to have this 5x for Win% and 5% for best human pros moves. With the option to switch both or one of them, on and off.