Typically, SRW hubs are more valuable since the DRW style appeals to a more narrow market. SRW axles seem to have faster and slightly higher resale than DRW axles.
Other than that I'd say it all depends on the intended vehicle set up and the style of wheels you want to run.
FWIW, I just made the SRW for DRW trade about 4 months ago but it's because I am going to run unmodified Hummer wheels. Mine was an even swap since it was with a friend, had it been pure business I would probably tried to make a little money on it since I had the more valuable SRW hubs.
HTH