Another Poolies selector question, my apologies

Ok so I know we are all so exhausted of seeing these by now but I want some advice on who to select from the 7* selectors.

I'm really just debating between DPX, Medusa, Silk and Photon, I have silk at 6*r5 and have a lot of other science champs I enjoy using (Count r4, DSH, Titania, Spot and Ham off the top of my head alone) so the science champs to me aren't as much of a priority but I know they're like the top science champs so I don't know if they're worth prioritizing here.

Medusa and DPX are locked behind glorious guardians so they're rarer. Medusa would be nice because besides Serpent at r3 and Knull and Venom r2, I don't really enjoy any of my other cosmic 7 stars. For DPX I have Onslaught r3 and then sinister, stryfe, Danni at r2, other than that no other Mutant 7star. I think dpx is the better nuke, but Medusa is more versatile, but needs the dupe for the defense.

Just yeah sorry over thinking this

Oh also if none of these, I could also go for like og storm or prof x but those would probably be much easier due to being in basic.

Basically, do I go for a top science champ thay I don't have yet even though I already have a solid science roster that I enjoy, or a pretty damn solid option for one of 2 classes where I don't have a lot of champs I enjoy using?

I'm slightly leaning Medusa but DPX does not need the dupe at all (Medusa is for defense but it still is nice)