I've had 2 OS cabs, a Trad slant, and Trad straight. I still have 1 OS and the Trad straight. I didn't find any difference in tone between the 2 OS cabs. My other guitar player bought one of them. They both sound amazing. Best sounding cabs I've owned, for sure. The Trad slant was so extremely bright that I couldn't deal with it. The Trad straight is great! It sounds like you would expect, I guess? For me, it has less weight to the notes compared to the OS cabs. It's tighter and clearer. Slightly brighter, but I think that's mostly because the low end is less accentuated. I like both for different amps. My EVH 100S is perfect with the OS, while my EVH 50 can get a little woofy sounding through the OS. But the 100S loses that weight through the trad, while the 50 cleans up and sounds tighter and more aggressive through the trad. I like having both, but overall I prefer the OS, and if I had to pick one, it would be the OS.
Both cabs currently have Karnivores, but I played them both a bunch with the V30s, too, before the Karnivores were released. Similar results, generally.