Actually the Schlacht-Version of the Fw 190 flew much different missions than the Il-2 (due to the course of war). The Il-2 was an aircraft for direct frontline CAS, designed to operate and survive directly over the frontline. The Fw 190 in the Schlacht role, however, mostly operated against the soviet supply organisation, the truck columns with ammunition, fuel and other essential supplies as well as artillery posts and the likes. This was where they were most effective (comparable to the fighter-bombers of the 9th USAAF and 2nd TAF) and not in directly attacking enemy tanks and positions.
I don't think such a comparison can be made. Which is why I won't make a choice here.
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