If you need more than reverb than there is no choice between them. But the PCM90/91 is a much better reverb. The PCM90/91 are the reverbs from the M300/300L which are from the 480L. The PCM80/81 reverbs are from the PCM70.
You might check out an Eventide Eclipse with it's dual engine and run 1-2 reverbs combined with something else. The Eclipse has what the PCM80/81 has and much more.
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- AudioGaff -
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