A strength edge sure, but Cassie's bracers are up there on the durability charts. Withstood blows from the atom axe, Superboy prime, etc. Her reflex feats are also in ample supply if we're going to go that rout. She defeated Match with his own heat vision and she defeated a Superboy robot the same way from point blank range (I'm talking she was sitting on top of him).
As far as her strength compared to Connor's strength, they were on somewhat equal terms during Cassie's Ares power upgrade. Jericho possessed Cassie and took Connor out in one blow (might have happened twice IIRC). She was destroying Match in h2h until she started crying about Connor, too.
Back to Knockout. Her only notable feat to me was taking on Barda. That being said, I give her points fr even being able to do that.
I'm probably the only one who read the Wonder Girl minni, but Cassie basically flew to Greece from San Francisco and blitzed the Furies on her own. She wrecked quite a few of them and only lost because Stompa got a lucky shot in while she was distracted.
It's hard to debate Wonder Girl right now because she is written so poorly under the current Titans run. She's the leader and she isn't really doing much of anything in the way of character development. Writers are scared to establish her current power levels. Regardless, it has been proven on panel on two occasions that she is now significantly stronger than she was when she performed all of her major feats and this fact needs to be taken into account. Brother Blood commented on this when tasting her and I believe Jericho might have as well IIRC.
Sorry for the rambling. I'm a bit sedated.