Hands down, Biggs is the greatest Rebel pilot at disrupting the opponents targeting priority. If he's parked next to a juicy zero-agility VCX-100, they still have pour their fire into Biggs. It's no surprise then that he is often equipped with R2-D2 to gain as much survivability as possible. Other builds include however R2-F2 to increase his agility each round as most shots will be coming for him. R4-D6 is another astromech worth considering.
Lots of options exist for keeping Biggs heart ticking, if you've got a support ship with Jan Ors on it for example this can give Biggs an evade token each round which is something else the opponent has to contend with.