Which DL should I pick up off waivers for this week?

Guru-

Who should I pick up off waivers?  Haloti Ngata or Charles Johnson??  They both have been on fire the past couple of weeks and seem to have good matchups this week.  Your thoughts?

Thanks in advance!

T. Watts

It depends on the scoring system:

Tackle-heavy=Ngata
Sack-heavy=Johnson