What is the difference between the John Deere 408R and STS12?

Here is how the John Deere 408R and John Deere STS12 compare on John Deere's published specifications:

• Horsepower: John Deere 408R 280 hp vs John Deere STS12 300 hp
• Wheelbase: John Deere 408R 169.3 in. vs John Deere STS12 152 in.