White Giant v Green Giant

Both are at their prime max power
No prep 
Morals off 
Win by all means 
No one is holding back 
Fight takes place on some farm lands
 
    
 
 
Green Giant can grow as tall as he wants
  
 
 
 
 
vs 
 
  
 
 
Hank Pym
 

Hank Pym isn't that tall.

Why? 
What?