My vote: Vic Beasley
Darrynton Evans just scares me too much for me to immediately trust him to pick up blitzes vs Harrison Smith or Yannick Ngakoue or to beat guys like Eric Kendricks in the open field. While I think his time is coming, I think he needs an adjustment period.
So, which EDGE helps the Titans the most? Well, Roberson is definitely the guy I trust to beat a tackle in a one-on-one situation on 3rd and 7. However, there is more to it than that.
The Titans need someone to help give Jadeveon Clowney and Harold Landry a breather on base downs and I think Beasley has a better chance to do that than Roberson given his experience and body type.
That means more juice from the starters when they are on the field, and there is also the hidden bonus of guys like Rashaan Evans and Jack Crawford not having to play out of position at EDGE to help get those other guys some rest.
It also opens up a much scarier four-man front where Clowney can line up inside or as a standup linebacker in the A-gaps on pass rush downs. For a team that seems desperate to drop extra guys in coverage, this makes their base rush a little bit less stomach-churning and hopefully helps lead to being plays on stunts and straight rushes.