Neither indeed. Vision is nice, but he does not even deserve a class gem. I'd probably use a science gem on Hulk though. But a generic is not worth it imo.
Personally, I would save a generic gem for someone else. I think both of these champs are worth their class awakening, but probably not a generic.
With that said, if you have what you want/need in the game, and are trying to ramp up your team a bit, these champs are both good champs who become great when awakened. So what is your need?
Double immunity and the best power control in the game? Vision.
No dont waste on vision or hulk . Hulk is beast when awakened but still he does not deserve generic awakening. I prefer sw or wolvie( plus those are not available in 5* also)
If you had a class awakening gem, you could awaken them both and be fine. but since this is generic it's much much much more complicated that than. You save that sucker for a star lord, AA, Dr. Voodoo, Wolverine, Scarlet Witch even.
Neither is worth a generic awakening gem. Using a class specific awakening gem on either is also debatable as there are better champs you could use a tech one on for sure.
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With that said, if you have what you want/need in the game, and are trying to ramp up your team a bit, these champs are both good champs who become great when awakened. So what is your need?
Double immunity and the best power control in the game? Vision.
Poison immunity and a powerhouse? Hulk.