But, I'm a Diesel/Electric fan and I would rather have 3 Overland SD70ACes than 10 Lionel or 100 MTH SD70ACes.
If you had both running side by side, nicely weathered, I'd think we wouldn't be able to tell the difference between them from normal viewing distances. If your normal viewing distance is from 1 feet away on a mantle then OMI would win out. I have a set of OMI soon to join my fleet of MTH, it would be interesting to see how they would compare running against my fleet of MTH modern EMD's and GE's. To make sure the observation is fair, I'll have to dirty up the OMI's quite a bit to reflect the real world prototype.