Who to farm past 5*? Qui Gon or Poe?

Poe is at 5.12*, Qui Gon is 5.16*. My arena team: Poe, QGJ, Geo (6.22) Sidious 7, Lumi 7.

QGJ's abilities/gear are near maxed, so he's really useful now. But instead of leveling him up, would it be better to give Poe some more health to protect the team a bit longer?

It just seems that since most teams are now 7* and level 70, Poe just doesn't last that long anymore.