Empire Tank - Stormtrooper or Sion

So I have Stormtrooper 7* right now. And he's an alright tank. I'm biased as I unlocked baze my first day and now have Old Ben. Both of them are awesome tanks!

My squad is

Palo
Vader
Tarkin
TFP (soon to be Thrawn as I unlocked him today!!)
Stormtrooper

I know Shore is the usual answer for an empire tank but it's gonna be a long farm to get him.

Would you guys use stormtrooper or Sion?