As ever, if you can get a friend to help with swapping, (and to sometimes say he's swapped when he hasn't, and vice versa), and you can detect a consistent difference then all you have to decide is (if the better one is more £££) is it worth it to you or not.
Monster cable = snake oil in the majority of cases, I bi amp via MF X ray pre and power amps with 1mm sq twin core cable. No issues with circa 300w (other than plates failing out the welsh dresser in the other room).
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