Maybe it's just me but 1 button or 3 buttons is basically a non issue, it's just a different way of getting to the same place. I set my preferences then vape, the only button I'm pushing 99% of the time is the fire button.
I've owned both and liked or disliked both which had nothing to do with the number of buttons. Many things are higher on my priority list when picking out a variable pv, accuracy, form factor, materials used, battery life, keeping the power at set point from the first vape to the last, durability, quality of the connector, available power for my toppers builds and preference, durability, service after the sale, heat-battery-current protection, etc.
There is no perfect PV or anything else for that matter and never will be for everyone. If not having or only having 1 button is a high on someones priority list choose accordingly, there are many choices out there.