Mk4 Chedak Commlink Dilemma

Welterweight

Hi all, I have a quick question. What do you suggest I use this full piece below?
https://swgoh.gg/db/gear/116/mk-4-chedak-comlink/

Options are:

1. Vader (to complete all gear pieces as he is now Mk11)
2. Kylo Ren for when I put him in my future Zader squad
3. Tie Fighter Pilot for when I put him in my future Zader squad and remove Sun Fac.
4. Boba Fett? (kind of my last resort as I don't intend on adding him) Keeping Darth Maul in squad instead.

Please provide answer and why.

Thank you.