I always thought it was Tony Crosland who said that "George Brown drunk was a better man than Harold Wilson sober" but apparently this phrase was actually first penned by William Rees Mogg in a Times editorial. What Crosland said, a propos of the 1963 leadership contest between the two men, was that the party faced "a choice between a crook and a drunk."
For my part, I have always regarded Brown as a much-maligned chap. The oft-repeated story about him going up to the Cardinal Archbishop of Lima while under the influence and asking him for a dance is almost certainly an invention, for instance.
Possibly the most fair-minded assessment I have read on Brown's career appears on a Derbyshire wiki project with which I am currently involved called You and Yesterday. You can read it HERE.