Frieza was the GOAT DBZ villain, and one of the most classic villains in the history of anime.
He had so many classic scenes that left you like "DAAAAAANNNNNG this dude is evil" 
 
He had vast armies and leagues of henchmen and cold-blooded killers at his command 
 
	
	
	
		
		
		
		
	
	
He was annihilating entire planets like 
 
	
	
	
		
		
		
		
	
	
He had no qualms with murking little kids...
	
	
	
		
		
		
		
	
	
He had the hardest, most 

 villain in the series crying like a woman as he died...
	
	
	
		
		
		
		
	
	
He bodied the hero's best friend right in front of him 
 
	
	
	
		
		
		
		
	
	
Not to mention that he was the catalyst for pretty much the whole series up until that point.
	
	
	
		
		
		
		
	
	
None of the villains after Frieza come close, IMO.