Based on numbers, Firsov was more of a goal-scoring guy than Kharlamov and Makarov. Then again, they didn't necessarily count 2nd assists - or counted them only at the end of his career - when Firsov was playing.
At least in his last season on the National team (1971-72), he was used as a (in soccer terms) 'midfielder' on a line with Kharlamov and Vikulov (de facto forwards), where he would concentrate more on defense and playmaking rather than goal-scoring. The line was hugely succesful during the short time they were together. This would suggest that he had the versatility.
I'd rank Kharlamov and Makarov fairly highly; they were the ones (at their peak) who would often carry the puck into the offensive zone and the ones who the opponent really needed more than one player to defend against, thus creating room for their linemates. They were good passers too; both had easily more career assists than goals. If they were not on the Lafleur level, then somewhat below.
Some other USSR 'playmaking wingers' worth to mention: Maltsev (played C too), Vikulov, Khomutov, Lebedev (maybe first and foremost a defensive winger, though?)...