a well trained operator of the x-o armor was able to go toe to toe with solar. granted, solar was a novice at the time, but even still, the fact that the armor could compete with him at any level is quite impressive imo.
but iirc, the 'most current' operator of the x-o was owned by tony's repulsor rays - which doesn't make sense considering some of it's other feats, but whateva...
Well, it was more based on the fact that the X-O Manowar armor is composed of an energy absorbing organism. It basically makes the armor extremely resistant to energy attacks. The X-O armor is far more vulnerable to physical attacks such as punches to the face.
I am a rabid X-O fan, but I'd say Extremis Iron Man/WM take this 8/10 at least and stomps X-O as a team.