I know it’s heavier, but an oxygen bottle is more reliable, and they make bottles out of fiber, now.
I think the Aviator O2 is cleaner. I’ve always been suspicious of generated O2.
An On-Board Oxygen Generating System (OBOGS) offers significant advantages over the traditional stored-oxygen systems used today on most high-performance, high-altitude military aircraft and commercial airliners.The on-board generation system is more reliable, safer and requires much less maintenance than a comparable stored-gas system. In addition, stored-gas systems have capacity limitations that simply do not exist with an OBOGS. In an OBOGS application, an adsorbent is used to remove nitrogen from the air, which in turn enriches the oxygen concentration in the outlet air stream. Materials such as zeolite are commonly used to remove nitrogen and concentrate oxygen.