When cleaning up credit & paying off old debts, is it better to pay debt in full or can I pay a settlement fee?

My ascendant has dual aged debts, some about 3-6 years old. It would be easiest upon us financially to compensate a marked down allotment upon these debts than to compensate in full. How would profitable a allotment fees upon a debts vs. a full change start his credit score? Keep in mind, a idea is to though a bag in a subsequent 6 months & goal to move his credit measure up as most pertinent probable & as alacritous as possible.

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