Board Thread:Questions and Answers/@comment-31702076-20170811184302/@comment-33728484-20170811192139

SSJ4 Goku, without a doubt. Because

1) He's amazing (when dokkan awakened).

2) He already has a leader skill, unlike Gogeta and Shenron.

Also, you'll be able to farm Shenron's SA when the new AGL Shenron comes out, even though he's not as easily farmable as Goku Black and other cards, so using Elder Kais on him wouldn't be the worst thing in the world.

By the way, I don't know if you've been taking advantage of this week's Super Strike Events discounts, but I hope you're ready to take on the LR Goku challenge (which will start tomorrow) in order to win 50 dragon stones and 10 Elder Kais!