Its hard to compare as its very dependent on the circumstances they inherit and you can really only judge after they go.
But its not looking good for Biffo
As an example, history SHOULD judge Bertie extremely poorly (regardless of his popularity at the time). Apart from the Northern Ireland peace process, his time in office was characterised by personal inpropriety, no real improvements in education and health despite over-flowing public coffers, and responsibility for stoking one of the biggest asset price bubbles in the history of modern civilisation.
But if you asked Joe Public, I'd guarantee many would say its Biffo what caused all of this.
So in answer to your question I reckon Biffo has a bit to go before he scrapes Bertie's level.
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