As a more "potent" offensive duo you would have to go with Joker and Murray because they are both great (one elite) playmakers on top of being able to score 25 every night. With Nash and Amare you have one elite playmaker/scorer and then just a scorer in Amare who at his peak was maybe an equal scorer to Joker but because he lacked any playmaking skills (and realistically he wasn't quite the scorer Jokic is because of three point shooting and off the chart efficiency) they just wouldn't come close.
Now if you are asking who is a better pick and roll duo then I think the argument is more interesting and I actually would lean Nash and Amare. I don't think anyone runs PnR better than Nash and by having Amare as his partner it gives him plenty of room for error when throwing the lob (not that he needs it).
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