drove Sico 2 years ago beginning of october, no snow whatsoever but then that won't give you any guarantee... Also no traffic either, met only 1 (tourist) truck all the way! Most traffic takes Jama which is all paved now. And yes the argentinian side of Jama is a great bikeroad indeed .
And as for landscape, I can't say Sico is that much more interesting so I'd say go for Jama.
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