The biggest difference is the nature of the overtones- the Rotos have a distinctive clang that no other string has, giving them a unique voice beyond the brightness or amount of scoop.
Otherwise I find them similar in the amount of lows, highs and mids, and maybe output, but the latter is hard to compare unless you are really testing it specifically.
Both will sit in a mix splendidly, and will cut through or blend just as well depending on your attack and EQ.
The DRs will stay bright much longer, and are more smoothly polished.
Last edited by One Drop : 02-06-2013 at 06:58 PM.