Well, before i had ridden either, i would of said PMBO. Just on pure speed, height, views, just everything about it was more appealing to me. Whereas Kumali was 'just another headbanger'. However, when i rode Kumali, i was open minded about it, but after the amazing first drop and loop, its boring, dull, and rough. The transition between the loop and the cobra roll is rough, the cobra roll is boring, the zero-g/inline twist felt sluggish and the last helix was just their to add to the ride length. I was extremely let down with the overall ride, and i would not go out of my way to re-ride it.
So, even though i have yet to experience it, PMBO wins it for me
Or, you could just ignore the entire rant about Kumali, and consider my opinion null and void until i can fairly comment
The Big One's helix is just a bit pants, the lapbars dig into your legs and the side of the car digs you in the ribs if your on the inside, Kumali's aint exactly magnificent either but its not uncomfortable.
One should be in the station loading, one should be in the first part of the circut, and one should be in the second part of the circut. Thats what a MCBR is for, so two trains can be on the track at once.
Unlike your theory, where one would WAIT at the MCBR...