Texans defense greater than the Patriots defense?

Do the Texans really have a better defense than the Patriots? This stat tweeted by Andy Hart suggests otherwise...

Patriots defense has been sneakily good, they've allowed over 20 points just once in the last six games. The game this Sunday will truly prove whether the Texans' defense or the Patriots' defense deserves the title of best defense. Let's hope the New England defense shows up and is ready to take on Houston.

Tom Brady (NE QB) and Matt Schaub (HOU QB)