Demolition = High meterless damage mid-screen.
Special Forces = Good pressure and good match pace.
CO= I don't see what is good with it
Covert Ops gets 2 50/50's every time you're in a block string. Her b14 string is something you need to actively block (OH to low) and then you get another 50/50 into this. No need to reload, no need to set up. Plus the parry is a total mental killer. If you just ate a 30% combo, did a wake up to have it parried, eat another 30% combo, you've just given up the match unless you had some insane life lead.
Saying Covert Ops is the worst variation is... questionable. Demo you get good meterless damage, but instead you used all 3 grenades to hit 35% when covert ops gets ~30% with no set up, dropping them on you to continue pressure (so the flawless potential is real) insetad of full screen to try to reload again.
All of this theory talk where "My character has so many tools!" totally ignores the tools other characters have and how nonsense it is to list out all the positive traits of a character and say it's obviously better. Look to the actual match ups, look to how games shake out. Covert Ops is about controlling the pace and getting inside their head. If they have to guess 2 or 3 times every time I'm in, they're going to guess wrong A LOT, and that means damage for Sonya.