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There isn't a great deal of difference between the two string materials D75, I would say requires less frequent feeds of wax to keep the fibres together, 8125 is stronger breaking strain per strand if I remember correctly, and makes the marginally faster string.
Tested D75 for 6 months,then changed to 8125.Average recommendation for recurve archer is 16 strands D75 or 18 strand 8125.....D75 gave best sightmarks.I tried 14 strand D75 against 16 strand 8125.D75 better sightmarks again.Not a lot in it to be honest though.
8125 gave me better groups and doesn't creep as much so i ended up changing to a 65" 18 strand 8125.(68" bow).Sightmarks are slightly lower,but groups at all distances did shrink enough for me to decide 8125 is the one for me.I liked using D75 so took some convincing.
Factory made stings never gave me the minimum 10 twists at lowest bracing height with either material so in my case had to get 65" made.This turns out to be what the manufacturer recommends anyway,for my bow.8125 supplied in a lot more colours,if thats your thing.
Do a search for "strings"....,i'm pretty sure there have been a couple of threads in the last 3 months or so on the two materials.