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Mark, do you find 1 system better than the other? Limitations of each? Just for rescue reasons, I like the adjustable FS.
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The adjustable FS is actually a little easier to move up the tree since it is stiffer. It would make for an easier AR also so now you mention that it is probably better. I say this because the climbers weight is on 2 parts of rope vs. the monkey tail which the knot and 1 part of rope caries all the weight. Also the FS set up might be more familiar to a climber at this point.
The monkey tail is less weight and easier to stow when not in use.