Well I got the Milodon and the Holley side by side. Sump area is identical as well as the rest of the geometry appears to e identical. Due to price point and build I'm going with the Holley!
Interesting. The placard I saw in the Milodon booth at SEMA said their pan gave better clearance below the pan.
Something else I noticed is that the Holley pan has "wings" to control oil returning from the top end. Might not be a big deal, but I think the OEM cast aluminum pans have the same setup.