Winner: It's a tie! Die Hard is a masterful piece of filmmaking with a truly unique story while Lethal Weapon is an era time capsule that is arguably more entertaining. Die Hard is one of those movies you watch once in a while and marvel at its near prestige accomplishments but Lethal Weapon is the crowd pleaser you view regularly.
Yippie-ki-yay mother f*cker and go spit. Have a Merry Christmas while you're at it, pal.