I'll confess I'm a bit biased, but I prefer the cassette toilet on the Northstar vs a black tank which requires a dump station to empty. You can easily empty the cassette multiple times in any outhouse without having to search out a dump station. It also appears the Laredo has the thermal windows. If you plan on doing any cold weather camping you'll appreciate those. Though they are more fragile than the sliders on the Lance. The Laredo also appears to have the removable short bed wraparound. Meaning the storage compartments on the rear overhang can be removed if you ever decide to go to a long bed truck, or ever sell it to someone with a long bed for that matter.
I too toured the Northstar factory when I picked up my Adventurer and can also vouch for their solid construction. And the support from Northstar is absolutely fantastic.
I'm not sure there is any significant difference in COG. A lot of that depends on how you pack.
I doubt you'll be disappointed with either choice and whatever you decide, happy camping!
Dan