Or, like the Millennium Falcon, the size of both the interior and the exterior of the ship changes based on the needs of the story.
For me, the kit I choose to get (call me crazy, but I'm not going to get both) will likely come down to how each kit handles the cockpit clear pieces. Whichever kit delivers the thinnest, most transparent, and in-scale looking glass so I can clearly see into the cockpit is the one that will win my $. I'm going to assume both kits will have similar levels of detail (or I can add them), but cockpit windows can be tough to pull off well.