Old Ben, Chewie, or Kit?

I've been lurking in this reddit for about a month (started playing GoH 2 months) and have found it to be the most valuable resource for information about this game. Before coming to this reddit, I was a hopeless newbie and got so frustrated that I ended up spending 400 bucks on shards for Chromium packs. I've since learned that there are much wiser ways to go about improving.

With that said, I find myself in a bit of a quandary with regards to the last spot on my GW "A" team and would love to hear the opinions of other redditers. The four characters I a regularly include on the team are:

QGJ (Leader) 5*

Aayla Secura 5*

Darth Sidious 5*

Luminara 4* (though my JC just hit 5* today so may swap them)

For the fifth and final spot I am considering the following:

Kit Fisto 5*

Chewbacca 5*

Old Ben 4*

I also have many other 4* characters which are considered good like Leia, Lando, Luke, Phasma, Kylo Ren, GS, Darth Maul, etc.). My rationale for mainly considering Kit Fisto and Old Ben are that they are Jedi and benefit from QGJ's leader ability and Chewie because he's the best tank I have right now. I am open to hearing any and all opinions even on the rest of my roster. Thanks in advance.