Shaktar Donetsk would smash any Championship side, Metalist Kharkiv and Dynamo Kiev probably would too. Top Belgian sides (Anderlecht, Genk, Standard Liege etc) would also fare well. There's not much debate to be had about the others, is there?
Fifth for attendances I reckon. In terms of quality (in no particular order) you've got England (prem), Spain, Italy, Germany, France, Portugal, Holland, Russia, then also Ukraine, Belgium....