Hands-down a DRW is mechanically more capable than a SRW. No contest.
However, some folks (and you may or may not be one of them) put a lot of emphasis on the all around capability of a given heavy duty truck. If a DRW was truly a win-win in terms of mechanical capability and all around practicality, no one would ever purchase an SRW. However, that's not the case, and why SRW's, in spite of being mechanically less capable, outsell DRW's by a significant margin.