Black Canary vs Siryn
I feel like this is basically a quickdraw unless one or both of them actually has some general immunity to sonics.
Canary does not, so there's that. She has pretty good reflexes as well, being a high-end comic book martial artist - how is Siryn for reflexes?
Why are we here?
"Superboy Prime (the yelling guy if he needs clarification)..." - Postmania
"...dropping an orca whale made of fire on your enemies is a pretty strong opening move." - Nik
"Why throw punches when you can be making everyone around you sterile mutant corpses?" - Pendaran, regarding Dr. Fate
Do either of them have any particular range advantage with their respective sonic screams?
100' isn't out of the question for Canary's scream, and it was recently beefed up. Not sure about how well it can be 'aimed' in the NuDC, but in Post-Crisis, she had arrived at the point where she could project sonics in a 'beam' with pretty impressive accuracy if she wanted to do so.
Basically, if Canary fires first and Siryn doesn't have any special resistance to sonics outside of her own use of them, I can see it messing her up enough that Canary takes it.
...wiki (always terribly unreliable) notes Siryn has demonstrated some resistance to sonics. Is this a constant thing, or a one-off?
Why are we here?
"Superboy Prime (the yelling guy if he needs clarification)..." - Postmania
"...dropping an orca whale made of fire on your enemies is a pretty strong opening move." - Nik
"Why throw punches when you can be making everyone around you sterile mutant corpses?" - Pendaran, regarding Dr. Fate