Most Useful Science Rankup

I have enough Science T6 Catalysts for another rankup - but I'm torn of who to take up and who would be most useful.
I'm Valiant, just starting into Battlegrounds, and a dabble of AW.
My main options I believe are 7* Quicksilver (unawakened), 6* Immortal Abomination (awakened), or 6* Red Guardian (awakened) but I'm open to other options - my only R5 Science is Human Torch, and I don't have Scorpion as a 6* yet, otherwise he'd likely be my top choice. I'm loathe to rank up any more 6* who are somewhat commonly available as 7*, even if I don't have them, which somewhat reduces the value of Titania, Hulk, Photon, or Silk. Maybe Cassie?
Here are my options:


I also slightly lower down have Red Hulk.
I'm Valiant, just starting into Battlegrounds, and a dabble of AW.
My main options I believe are 7* Quicksilver (unawakened), 6* Immortal Abomination (awakened), or 6* Red Guardian (awakened) but I'm open to other options - my only R5 Science is Human Torch, and I don't have Scorpion as a 6* yet, otherwise he'd likely be my top choice. I'm loathe to rank up any more 6* who are somewhat commonly available as 7*, even if I don't have them, which somewhat reduces the value of Titania, Hulk, Photon, or Silk. Maybe Cassie?
Here are my options:


I also slightly lower down have Red Hulk.
Most Useful Science Rankup 36 votes
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Comments
As someone who have been focussing on 7*s..... r6 photon have worked in various content outside BGs.
She is not just a defender if that convince you.
Personally, I think Silk is a major item-saver on so many modes and will likely R3 mine next cycle.
Dr. Zola