Why are you changing 2 variables. Endurance is your ability to perform at a certain level for a period of time. Kipchoge has more endurance than me because he can maintain my 800m pace for 26 miles. Speed is literally only a consideration for sprinting. As soon as you're performing past that, it's all endurance. And when we look at all tests of endurance; iron man, ultra marathon, military fitness, triathlon, etc etc. Men come out on top.