Depends on what you are looking for. Dengar can help with Raids & Scoundrels. IGD could be good in the new raid. RT if you want to beat the Resistence Mod battle. Snowtrooper if you want to beat the Empire mod battle (and ewok assault). Luke if you need another rebel. I have Gam Guard & IMO he's not a great tank bc of how the AI uses him. My 2 cents.
I maxed out Luke, Rey and EE long before raids were introduced and will be done with Dengar & JE within a month. Think I'd rather farm gear than get any of the other options.
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well its not really up to you because any of those are random making farming erratic and foolhardy its better to get what you can..
but if you can go snowtrooper he is empire you might need it for the ewok event
-Dengar is really good for this raid, but by the time you get him the new raid will probably be out.
-Resistance Trooper is needed for the Speed mod challenge also
I would probably stay away from the rest of them