What is the most important attributes for a 3-4 defense

Any tips would help thank you

For me, I want big bodies on the 3 down linemen with strength and blockshed. For my 2 OLB, I need speed. For my 2 ILB, I need height and zone coverage

Streetz said:

For me, I want big bodies on the 3 down linemen with strength and blockshed. For my 2 OLB, I need speed. For my 2 ILB, I need height and zone coverage

Sums it up well. I would add that the safeties need to have good coverage stats. 
 

I will add the 3 DL usually are a Big Nose Tackle then strong big guys for the ends; Reggie White type player. Basically 3 DT.