For me, it is all about beam profile. Less lumens reaching out narrower and further, or more lumens, wider, reaching out not as far.
It depends on if you want a narrower beam going 655 meters, or a wider beam going 286 meters.
The 3 x XHP70 yields 9,000 lumens for 286 lumens, and the 4 x HHP35 yields 6,000 lumens for 655 meters, as far as I know.
Both lights are very, very attractive. Anyone who is interested in high quality lights of such size/power classification would do well to get both.
There are lights with more 70's and with more 35's, but they are not as attractively sized as the two that you have narrowed down to.
User interface is the least important criteria when I choose a light. I can turn it on and off, and I can get to lowest, and I can get to turbo. Good enough for me.