I havent yet read the Ravenor series, so I cant make a fair asessment of his abilities in comparison to Eisenhorn's come the third series. But, if I had to choose with hero and his retinue would emerge on top, I'd have to go with Eisenhorn. Not just for his own wily ways, but because knowing him he will have only improved his control over his trump card that is Cherubael. (I really loved how his more tightly controlled daemon-host body was still quite snarky, those last few pages were great.) I dont doubt Eisenhorn would be unwilling to release that daemon fully again only to once again ensnare him when it did its thing once more. Though I can also see it where Ravenor's side actually manage to defeat the bugger, at great cost to their own of course.