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Definitely no "right" answer.
To make matters even more complicated, at least Faber has 2 different types of tanks that people might call HP tanks. The 3500psi versions are much heavier than the 3442psi versions, so you need to consider weighting issues (how much, distchable vs non-ditchable, etc) when choosing your tanks. A cold-water diver will probably prefer the heavier tank.
FWIW, I have FX120s (3442psi) and I often get short fills. When I learned to plan for them being 105s I became much happier. As a matter of principle, I'd rather underfill an HP tank than overfill an LP tank, though
there's something to be said for LP tanks if you can get over-fills.
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