One difference between a load switch and the MAX40200 is that the load switch allows current to flow in both directions. So if you are Oring two voltages with a single device you can run into the scenario where you could have a higher voltage feeding a large amount of current to a lower voltage if they are both present and the switch is on. The MAX40200 acts just like a diode and will automatically turn off when reverse biased which eliminates this issue.