Whic 7* tech is worthy of 2->3 gem?

Disclaimer that I don't have all the good ones, and most are not duped.
I don't wanna R3 Shuri, Hulkbuster is an option, I might also hold on and wait a bit, but for who?

I don't wanna R3 Shuri, Hulkbuster is an option, I might also hold on and wait a bit, but for who?

1
Comments
If bgs are your main priority, rank up shocker
Og iron man 2nd option