Superior strength, elasticity and regeneration capabilities that allow her to go up against enemies much stronger than what Poly or Disquise Merge could handle. She’s like a combination of Plastic-Man and Luffy’s Gear Five. Her Shapeshifting capabilities might be greater too but that’s really up to you to decide, you created Poly and Disguise Merge so you’d know better than I if you compared what they’re capable of through a Shapeshifting position compared to what I described Cellular Merge and her abilities being like.

Also, can Poly Merge change himself into multiple things at once? If not than Cellular Merge would have that over him as well.