So I am sitting in my office, playing with an MX Green switch I brought in from home (to show a co-worker) and of course I have my buckling spring keyboard in front of me - when I get the idea to press them against each other to see which is stronger.
I always assumed the MX Green had the stronger spring - since it feels that way by itself.
However, I find that when I press the two together (using the Cherry switch upside down, pressing its stem to a BS keycap) it is always the MX Green switch that actuates first - well before the BS switch does. Additionally after both have clicked, when I slowly release the pressure between the two switches, it is always the BS switch the resets first, and then MX Green after.
Doesn't seem to matter where on the BS cap that I press, or which key that I use (and this is on a daily driver BS board that I have had for over a year).
I realize this is only one data point - as the key travel distance and other variables are present // but just wanted to share.