I am guided by high quality oximeters. Pulse delivery systems deliver way less O2 than continuous flow machines. One can measure their oximetry with both systems and easily see the difference in how well they are able to remain oxygenated.

As said above, you only get a MAX of 1.26liters/minute if you use the Inogen 1 G5 or Rove6 at its highest rate of 6 pulse! This is one of the lower settings on a stationary concentrator!