Gigantophis garstini vs. Dakosaurus maximus

[dinosauria101]

Gigantophis garstini

snake-facts.weebly.com/uploads/6/5/5/3/6553869/published/gigantophis-garstini.jpg?1488853262

Order: Serpentes
Family: Madtsoiidae
Length: 10.7 meters
Mass: ~600 kg, based on relatives
Diet: Large mammals
Age and Location: 40 million years ago, Eocene epoch, Egypt
Killing apparatus: Constriction, jaws
One of the largest snakes ever to live, second only to Titanoboa. Thought to have preyed on ancestors of the elephant.

Dakosaurus maximus

upload.wikimedia.org/wikipedia/commons/thumb/c/c2/Dakosaurus2.jpg/800px-Dakosaurus2.jpg

Order: Thalattosuchia
Family: Metriorhynchidae
Length: 4-5 meters
Mass: 450-910 kg
Diet: Marine reptiles and fish
Age and Location: Late Jurassic to Early Cretaceous, 157-137 million years ago, Europe
Killing apparatus: Slicing jaws
One of the largest of the metriorhynchids. Had very large, serrated teeth and is thought to have had salt glands to help cope with oceanic conditions.

[6f5e4d]

Dakosaurus can win, it has slicing jaws and a larger weight, plus could likely move in water better than Gigantophis.

[dinosauria101]

I give my vote to Dakosaurus as well. A bit larger and a good set of jaws - I'd imagine it can avoid constriction long enough to land some fatal bites.

Edit: Here's also a size comp. Dakosaurus is scaled to 4.5 meters, Gigantophis is 10.7. Scalebars are 1 meter each, Gigantophis by Gamma 124 and Dakosaurus/scalebar are by the people who wrote the description paper for Plesiosuchu