which oxygen system: Aerox or Precise flight?

[Badger]

I purchased a plane/hangar, and the previous owner include two systems in the purchase.

I'd like to keep one and sell the other. Which one should I keep?
info: Bonanza, midwest flying so 13,000 max, usually 2 people.

 

[flyingron]

I like the compactness of the Nelson/Precise regulator especially coupled with their demand flow second stages.