Giganotosaurus Is By Far The Biggest I know For a Fact i Have Done Lots of reserch on this and the 2nd is the new Found Mapusaurus 3rd is Saurophaganax 4 is spino and 5th is Rex Now this is Not Done By Power if i was it would Go like This
Ye Spino is the larges therapod, Ultrasaurus is the overall biggest
isn't Diplodocus the largest, its over 75ft long
There is still a debate wether Ultrasauros and Supersaurus are the same dinosaurs...They do share the remains.
Actually, the largest Dinosaur of all time goes to Argentinosaurus...It weighed possible over 100 tons. The Longest goes to Seismosaurus. The only remain was a juvenile that possibly choked on a gastrolith...it was 150 feet long.
-Frogfish- Researcher-Prostate Cancer Oncogene Research University of Michigan Comprehensive Cancer Center