Utility
Neither the Navigator nor the Lincoln Navigator L has a marked advantage with respect to seating capacity.
There's no clear winner between the Lincoln Navigator and the Lincoln Navigator L when it comes to transporting cargo.
There's little the Lincoln Navigator can tow that the Lincoln Navigator L cannot.
Performance
With that kind of horsepower, both the Lincoln Navigator and the Navigator L are legitimate sportscars.
Dimensions
The Navigator L is substantially more bulky than the Navigator.
Your wallet will hurt more every time you fill up the Lincoln Navigator L than the Lincoln Navigator because of its larger tank.
The Navigator and the Navigator L compete for the same parking spaces.
The Lincoln Navigator L's longer wheelbase will likely result in a smoother, more stable ride; on the flip side, the Navigator may give a more agile feel in daily traffic.
Cost
Regarding MSRP, the Navigator doesn't cost much less than the Lincoln Navigator L.
Handling
With their comparable turning radii, the Navigator and the Lincoln Navigator L likely handle roughly the same into and out of tight spots.
Comfort
While the front cabin in the Lincoln Navigator offers a bit more head room than the Navigator L, there frankly isn't much of a difference.
The Lincoln Navigator is not particularly roomier for your passengers than the Lincoln Navigator L.
Warranty
The Lincoln Navigator L and the Lincoln Navigator have the same basic warranty.