Titans defense over chargers week 1!?!

So I have chargers defense (who finished 15 defensively last season) but they’re playing KC (finished 5 as an offense last year) who can put up a lot of points. The titans defense (who finished 13 last year as a defense) is playing the dolphins (finished 25 as an offense last year) who I think might be the worst team in the nfl this year. I know the chargers defense is a better unit but should I play the matchup and pick up titans defense off waivers for week 1?

I am looking to grab the Saints at home against the Bucs week 1. Saints should be up big, forcing Bucs backup QB to throw it = turnovers and a big fantasy game for the Saints DST.