A lot of boxers went 10 with Vitaly, that's about the time he usually finishes them off. I doesn't mean they're all about the same class.
Right now I'd say Solis purely due to his pedigree, but he hasn't impressed me that much , especially after his last clunker vs. Austin. As for Sosnowski besides the Vitali fight, I haven't really seen him fight. But I'd feel better picking the between the two after their next respectful fights.
Sosnowski by UD Solis sucks, he was horrible vs Austin(who's even worse). Hes a fat, overweight slob. Sosnowski at least is fit, has decent movements, speed, and overall has the dedication in the ring and doesn't disrespect the sport. Solis has none of these. Sosnowski at least has that rapid killer type instinct(as seen in the Danny Williams fight). Solis had a dead man in front of him(Austin) and still couldn't put him away! Sosnowski would also beat Harrison(which he would of if Vitali didn't give him that title shot) Dimitrenko would also beat Solis.
The same Sosnowski that lost against the great Zuri Lawrence and knocked out by Arthur Cook? The same Dimitrenko that was out jabbed, dropped and bullied around the ring by a fighter 7 inches shorter than him in Eddie Chamber's? Ray Austin is at least proven on the world level, he had a close draw with Ibragimov who was a world champion...