Usually it is 88 or Han I believe. I run 88 and he's a bit squishy for my liking but he does pack a lot of damage and he's quite efficient if you run a high DPS team (and is much more efficient with Poe).
If you don't have a good tank (i.e. Poe) then Stormtrooper Han is a very viable option with his turn meter manipulation.
Then there's Eeth Koth (or whatever his name is). I don't have him yet, but I'm currently farming him for the Jedi challenge coming up this week, and I plan on having him 7*s for the next time the challenge comes around. So if you want to do well in the Jedi challenge and need a Jedi Koth is the way to go.
Koth if you're doing the Jedi challenge. Han if you need a LS character. 88 if you are running a droid team or need a DS character. Savage is also decent for GW and is receiving a buff, so you could get him as well for DS characters.
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If you don't have a good tank (i.e. Poe) then Stormtrooper Han is a very viable option with his turn meter manipulation.
Then there's Eeth Koth (or whatever his name is). I don't have him yet, but I'm currently farming him for the Jedi challenge coming up this week, and I plan on having him 7*s for the next time the challenge comes around. So if you want to do well in the Jedi challenge and need a Jedi Koth is the way to go.
Go to the general tab of this site and look at the February Patch notes. You'll probably poop yourself